Originally Posted by second 70
Chip I ran the same Mobil 15w50 synthetic in my hemi. It was labeled as racing oil and did contain 1200p zinc.

Yep, good stuff. up Only reason I stopped using it was for a while, I couldn't find any on the shelf anywhere.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax