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This tag should be used for anything related to the use of automotive engine oil, or in reference to other parts of the car that also require lubrication using oil.

8 votes

Are there different kinds of 10W-40 oil?

The SAE grade (in this case 10W-40) only specifies the viscosity of the oil - it doesn't say anything specifically about the composition of the oil or any additives it may have. … So for a particular viscosity grade, it might petroleum-based or synthetic (or a mixture of the two), and might have any number of additives that affect various properties of the oil. …
UpTheCreek's user avatar