I'm using Hughes roller lifters and

think about that 20w Bob if you start cold
I used to do 20w-50 in the summer but no longer do
However it really worked good in a mid 80's VW Waterboxer Vanagon
everything else would burn oil- go figure
I rebuilt that motor- got the parts from "Boston Bob" great resource now gone
NEVER AGAIN on that motor

20w50 , supposed to act like 20 w when cold , and protect like 50 w when hot , that's what I think -----------