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Originally Posted by Vu
I use 15w-40 or 20w-50 for my trucks for years now. I always used 20w-50 for my 2.7 4 cyl t-100 and it ran fine. Same for my tundra.
I switch from synthetic to regular oil all the time. Don't worry about that leak myth.
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15W-50 or 20W-50 is for engines built with loose clearances or engines with clearances worn well beyond what they should be. In a tight engine I think you'll find that you'll get higher internal friction and slightly worse gas mileage with no benefit.
Ken