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Subjects>Auto>Automotive Information

What is the difference in 20w 40 and 15w40 motor oil?

Updated: 9/28/2023

Wiki User

∙ 12y ago

Best Answer

Only the weight of the oil, 20w 40 is thiker than the 15w40, 20w 40 is the best oil for the old cars although 15w40 is very easier cold start ...

Wiki User

∙ 12y ago

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