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So, what do these numbers mean? What do numbers mean on your oil? There is a lot of misconception
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because these 5, w, 30... 5 should mean something, maybe it's temperature, maybe it's viscosity.
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Well, these are all numbers that represent temperature and viscosity, but they are indexes.
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They are indexes. They don't mean something literally, like it's not minus 5 degrees Celsius.
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So, this SAE number is divided into 2 parts, 5w and 30. In the 5w, W means winter. But of course,
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it doesn't mean that this oil should only be used in winter. It just means that 5w represents the
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way this oil behaves in the cold weather. It means that in the cold weather, this oil will have this
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type of viscosity. 5, we don't know what 5 means. For a user, it doesn't mean anything at all.
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And then the second part 30 is considered to be temperature. Up to this temperature, this
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oil will save its viscosity. It's also not true in modern oils. This is also an index number and
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it doesn't mean the temperature, it doesn't mean the viscosity, it just means the type of oil. So,
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the higher this number, the longer the oil will save its viscosity and stay viscose. That's why
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in sport cars, they will use 50 or 60 type of oil. Yeah? They will use 10w-50, 10w-60. And it means
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that in high temperatures in performance engines, this oil will still have some viscosity to protect
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the engine parts. The majority of modern oils will have more or less the same viscosity
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between minus 20 degrees Celsius and plus 40 degrees Celsius, the majority of modern oils,
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0w-20, 10w-40, 5w-30, they will all have pretty much the same temperature range. The difference
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is in viscosity. The initial viscosity is meant by this SAE 5W, 5W. The lower the number before
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the letter W, the less viscose the oil is. And the modern engines, especially small turbo engines,
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will need less viscose oil. So, a lot of modern engines will use 0w-20 or like my car will use 5W.
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Almost no cars these days will use 10w, or 10w-40, for example. So, to recap everything I've said,
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you don't need to think that these numbers 5, 30, 0, 20 mean something to you like temperature
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or whatever. No, this means that the manufacturer says that this viscosity is good for your car. And
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you should always buy the oil that is recommended for your car. There may be several recommended
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types of oil. Now, there is one more thing. A lot of manufacturers will tell different types of
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viscosity for different countries. For example, in the USA they recommend 5W-30 for a certain engine.
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And in Norway, for the same engine, for the same vehicle, they recommend 0w-20. And you say, wow,
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I can use 0w-20. Not exactly, because Norway has different climate and it's colder. And
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if you use the oils that are recommended for Norway, you may cause some harm to your engine.
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It doesn't mean that it will be completely bad. It's possible to use this engine oil.
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But the manufacturer thinks that if you use the 5W, 30 oil, your engine will live longer.
