Well, I was dumb, to put it simply.why are you using 10w-40? isn't mobil's 10w-40 for high mileage vehicles? all there regular oils (like 0w40, 5w30, and 10w30) are all API SM certified and have every standard certification they can get. i can't imagine they're bad if they've passed every commonly used national and international standard. not to mention it's standard/approved for use in several high performance cars (vettes, vipers, porches, bmws, etc). not saying it's the best oil you can buy, but it's not bad.
Mobile 1 5W30 is a great synthetic, there shouldn't be any issues running it.Well that sucks I just put Mobil-1 5-30 in today. Is it at least better then regular oil?
What should I use next time?