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Originally Posted by Stooge
Many fleet organizations use 15W40 in everything (gas, diesel, even lawn equipment) with great success and long engine life. Many will state (including many at BOBSTHEOILGUY) that 15W40 diesel oil is too heavy, not right and question why. I would look at the results of many fleet owners (such as Utilities) with many cars, trucks, heavy equipment - everything gets the 15W40.
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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.