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There's a number on a court filing from
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1997 that most oil companies hope you
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never see. Lab tests found that bottles
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labeled full synthetic, sold on the same
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shelf, same year, same brand, contain
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two completely different things. Some
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bottles were genuinely synthetic. Other
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bottles tested independently came back
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as 100% regular oil. Same word on the
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front, different liquid inside. Here's
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the part almost nobody explains
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correctly. What actually happened wasn't
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a court ruling. It was an advertising
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review board. And the decision they made
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25 years ago is the reason the word
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synthetic barely means anything today.
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I'm going to show you exactly what's
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really going on inside that bottle in
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plain English. No chemistry degree
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required. And by the end, you'll know
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which brands are straightforward with
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you and which ones are technically
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telling the truth while hoping you never
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ask a follow-up question. And before you
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assume this is some conspiracy theory,
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one of the biggest oil companies in the
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world actually challenged this practice
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directly. They spent real money testing
1:03
bottles off store shelves. They filed a
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formal complaint. And what happened next
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didn't just affect one brand for one
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year. It quietly changed the entire oil
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industry for the next 25 years. Most
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drivers have no idea it happened at all.
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Here's the part you need first before
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any of that story makes sense. Part one,
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the only thing you actually need to
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understand. Here's the one concept that
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explains the entire deception. There are
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two ways to make a synthetic oil. The
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first refine crude oil so intensely that
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it becomes extremely pure. This is group
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three. It still starts as crude pulled
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from the ground. The second build the
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oil molecule by molecule in a lab
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starting from gas instead of crude. This
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is group four or PAO. Nothing like it
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occurs naturally. Here's the twist. Both
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are legally allowed to say full
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synthetic on the bottle. The label can't
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tell you which one you're actually
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holding. So, this isn't a story about
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fake versus real. It's a story about
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which brands are upfront about what's in
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the bottle and which ones let that word
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do more talking than the chemistry backs
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up. One thing matters more than the
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rest, the certification stamp. Look for
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APIs or the ILSAC Starburst. That's your
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real safety net. No matter which base
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oil is inside, keep that in mind as we
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go. Part two, where this whole story
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started. In the late 1990s, Castor's
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most popular synthetic oil quietly
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switched its main ingredient. It had
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been using the labbuilt PAO oil. Then,
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without making a big announcement, it
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switched to the heavily refined crude
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oil version instead, Group Three. A
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competing oil company tested bottles
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from storeshelves and found some of them
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contain no labuilt oil at all, just
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refined crude. They filed a complaint
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not with a court but with an advertising
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industry review board called the
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National Advertising Division. This is
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the detail that gets misrepresented
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constantly online. This was never a
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lawsuit. No judge was involved. The
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review board looked at the evidence and
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decided that heavily refined crude oil
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could fairly be called synthetic because
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the manufacturing process changes it
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enough to count. That ruling had zero
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legal authority. It couldn't force
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anything. But every major oil company
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saw what had just happened. And over the
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next few years, most of them quietly
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made the same switch because the refined
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crude version was about half the cost to
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produce. That's the real story, not a
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courtroom drama, a marketing decision
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that the rest of the industry copied
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once they saw it was allowed. Part
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three, the transparency countdown.
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Here's where this gets useful. Let's
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look at five major brands and rank them
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by one simple question. who's actually
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being straightforward with you about
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what's in the bottle and who's letting
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the word synthetic do more talking than
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the chemistry backs up. We're counting
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down from least transparent to most.
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Number five is the brand most
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comfortable letting the label do the
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heavy lifting. Number one is the brand
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that hasn't budged in 50 years. Number
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five, Castrol Edge. This is the brand
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that started everything you just heard
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about. Today's Castrol Edge uses the
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refined crude version, Group Three. Like
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most major brands on the shelf, it still
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passes every current performance
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certification and for typical daily
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driving, it does its job well. The
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honest framing here, you're paying a
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premium price for a brand name and a
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strong additive package, not for labuilt
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oil. Castrol doesn't go out of its way
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to clarify that distinction on the
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label. That's why it lands at number
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five. Number four, Mobile One. Mobile
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was the company that originally
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challenged Castrol back in the 1990s for
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using crudebased oil while marketing it
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as synthetic. Today, most of Mobile
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One's own standard lineup also uses the
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refined crude version. Their longer
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interval extended performance line
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contains a higher percentage of the
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labuilt oil, but their everyday formula
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largely followed the same industry shift
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everyone else made. There's a real irony
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here. The company that started this
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entire argument ended up making the same
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business decision it once criticized.
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That's worth knowing and it's why Mobile
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One only edges out Castrol by one spot.
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Number three, Liquy Moly. A lot of
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people assume any German branded oil
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must be the labbuilt premium version
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because European countries have stricter
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labeling rules. Here's the nuance that
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matters. In the United States, most of
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Liquole's lineup is actually the same
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refined crude group 3 oil as everyone
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else. Only two specific products in
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their US range use the labbuilt version.
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The brand still performs well and
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carries strong manufacturer approvals.
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Liquoly lands in the middle because it
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doesn't lean on the German engineering
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assumption the way marketing around it
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often does. The chemistry is honest,
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even if the popular assumption about it
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isn't. Number two, Penso and its sibling
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brand, Quaker State. Both are owned by
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Shell. Here's where it gets genuinely
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interesting. Penso's top tier oil, Ultra
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Platinum, has built its reputation on a
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real technological advantage. Shell
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takes natural gas and converts it into a
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base oil through a specialized process,
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resulting in a base oil with very few
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impurities. And independent testing has
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shown it keeps engines noticeably
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cleaner over time. Worth noting, a 2026
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supply disruption affecting Shell's
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natural gas processing plant has led to
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some label wording changes in Penso has
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stated the formulation itself hasn't
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changed. But it's a good example of why
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checking the current bottle in front of
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you still matters more than any video,
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including this one. Quaker State's
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standard full synthetic line does not
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use this same process. It uses the more
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common group three refined crude. There
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is a separate higher tier from Quaker
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State called Ultimate Protection that
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does use the natural gas process. So,
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the lesson here isn't Quaker State bad,
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Penso good. It's that within the same
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company, the tier you choose actually
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matters more than the brand name on the
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bottle. Penso earns the number two spot
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because the technology is real and
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verifiable. You just have to know which
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bottle on the shelf is the one that has
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it. Number one, Amsoil Signature Series.
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Amsoil built its entire reputation on
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labbuilt PAO oil starting back in 1972
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when it became the first company to sell
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a synthetic motor oil that met API
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standards at all. While most of the
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industry quietly switched to the cheaper
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group 3 option after 1999, Amsoil held
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out for decades on a PAO heavy formula.
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Here's the most current and most honest
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part of this story. Amsoil's own
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enthusiast community has noted that
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recent batches of signature series
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contain less pure PAO than the formula
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used to now blended with esters and
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other synthetic components rather than
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being a single pure base stock. Amsoil
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has also confirmed a significant
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reformulation of signature series is
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underway. None of this makes it a bad
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oil. The additive package remains
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genuinely strong and it still
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outperforms typical store brand
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synthetics on extended interval testing,
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but the we never compromised once
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version of this story isn't quite
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accurate anymore. And you deserve the
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current picture, not the legacy one. It
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still takes the top spot on this list.
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Not because the formula has stayed
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frozen since 1972, but because Amsoil
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remains the brand most willing to
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publish its actual test numbers instead
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of just leaning on the word synthetic
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and hoping nobody asks a follow-up
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question. Part four, what this actually
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means for your next oil change. Aaron,
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here's the practical takeaway without
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the chemistry lecture. For the vast
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majority of daily drivers doing a
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standard oil change schedule, the
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difference between the refined crude
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version and the labbuilt version is
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small enough that it rarely shows up in
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realworld engine wear. The certification
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Starburst matters more day-to-day than
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which manufacturing method made the base
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oil where the labuilt oil genuinely
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earns its higher price. severe driving
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conditions, extended oil change
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intervals beyond what's typical, extreme
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heat, heavy towing, or track use. If you
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change your oil on a normal schedule and
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drive normally, you're very unlikely to
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notice a difference. What actually
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matters more than any of this debate,
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changing your oil on schedule, using the
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viscosity grade your manual specifies,
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and making sure the bottle carries
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current certification. Get those three
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things right and the base oil argument
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becomes far less important than the
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marketing makes it sound. So here's what
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you now know that the bottle alone won't
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tell you. The 1999 decision that started
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all of this wasn't a courtroom battle.
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It was an advertising review board
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ruling that had no legal teeth and the
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entire industry followed it anyway
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because it was cheaper. Most major full
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synthetic brands today use the heavily
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refined crude version, not the labuilt
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version. And that's not automatically a
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problem. Modern refining has closed much
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of the performance gap. Some brands are
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straightforward about this. AMS soil has
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stuck with labbuilt oil since 1972.
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Penso's top tier uses a genuinely
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impressive natural gas process. Others
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like Quaker State and Mobile One
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Standard Lines simply followed the
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industrywide shift toward the cheaper
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option while keeping the word synthetic
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front and center on the label. None of
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this means you're being scammed. It
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means the word synthetic tells you less
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than the certification stamp does. And
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now you know to look for both. For 25
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years, drivers have argued in parking
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lots and online forums about which
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synthetic oil is really the best. Here's
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the irony in all of it. Most of them
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were arguing about a word that stopped
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having a clear meaning back in 1999. The
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bottle didn't change. The definition
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did. If this changed how you'll read a
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bottle next time you're standing in that
10:45
aisle, share it with someone who's about
10:47
to buy oil this week. Subscribe to your
10:50
motor care for more automotive
10:52
information that holds up under
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scrutiny. And tell me in the comments,
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what oil are you currently running? And
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did you know which base oil was actually
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inside it? I want to see how many of us
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actually knew before
