Quote: 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.
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.
