Not to hijack the thread, but I've been reading from a lot of people that use 5w-40, but nowhere in the manual does it specify 5w-40. Maybe 5w-30 for lower temps, but everything else is 10, 15, or 20 and W-30, 40 or 50.
I've been using Mobil1 10w40 full synthetic, because I'll never drive it when temps are below 14F, I may sometimes drive it when it's below 50, and most often drive it when it's above 50F.
Could someone explain the thought behind using 5w-40 when it's not spec'd in the manual? Obviously since so many people are using it, there must be some reason that I'm missing. School me, please!
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