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Re: Is 5w-40 oil alright to use?
Running Mobil 1 5W-40 right now, 90-some thousand miles on the engine. Ran it for 10k miles last time and the old oil looks almost new. BUT, I'm not having my oil tested. So, all I can say for sure is that my car is still running well.
Weird coincidence, too, that I took a trip right after the oil change and got 28 mpg. Can't be the oil, right? Prior to that, I'd never recorded better than 24 mpg.
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