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I think that this question is prolly better answered in the Oil and Lubrication Forum.
My .02.
Personally I like to stick to the Motorcraft 5-20 and a Motorcraft filter for my 02 F-150, and Castrol 5-30 Gtx and a motorcraft filter for the wifes Taurus.
amsoil-0-30 & amsoil sdf filter-change oil once a year , change filter and top off ever 5 k miles
last truck- dodge ram- 120 k miles no problems
89 trans am- 175 k miles - no problems[still have]
Amsoil 0W30 100% synthetic with Amsoil filter
Amsoil transmission fluid, both tranny and transfer case
Amsoil 80W90 synthetic gear lube, front diffs.
Ford synthetic gear lube, rear diffs. (with friction modifier) (stock)
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