Re: 1938 Packard Hearse - HELP PLEASE!!!!!!!!!!!

Posted by Dave Kenney On 2008/8/7 7:56:57

I use 15-40 Diesel oil (usually Shell Rotella) in my '47. I have been stocking up on the old SJ oil since the new SL and SM grades have reduced levels of zinc (ZDDP) additive helpful in these old flat tappet engines.