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If your engine was built with close tolerances,why would you want to use such a thick oil? Especially on an engine that will mainly see low R.P.M.'s.

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Even factory tollerences should only require 10w 30 or 10w40.

20w 50 is too thick in a fresh motor

As for straight weight's(sae 40, etc..) they are for lawn mowers, given the availability of much better modern stuff.

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If you ask 20 different people,you'll get 20 different answers.Anyone ever read an owners manual?

Also,as far as zinc content is concerned,everyone will tell you theirs is best.Do what I did with Brad Penn,pay to have an analysis done then you will know.