It gets even more confusing when trying to decide which kind of motor oil you should use. 10W-30, for example, sounds very close to 10W-40. After all, how different can they be? 10W-30 and 10W-40 ...
The more resistant oil is to thinning, the higher the second number (10W-40 versus 10W-30, for example ... what's recommended for winter use. However, synthetic oils can be formulated to flow ...
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