Oil Recommendation/Solid lifter 427

[Steve Shauger]

I was using castrol 20-50 along with the GM EOS which provides the correct zinc level and worked well. However for a short period EOS was nolonger available from GM until it was reintroduced under another part#. Anyway out of necessity I found Brad Penn 20-50 which has zinc and the proper detergents to minimize acid build up as well. I have had excellent results.