The Ford Barn - View Single Post

rotorwrench · 05-28-2018, 09:25 AM

You have that right DD931. There is plenty of ZDDP in any modern oil for a relatively stock flathead. If it's a fire breathin heathin then maybe more might be better. 1200 PPM of the stuff is the max that does any good. More is not better. 800 PPM is plenty for a flathead. Now, if you have a 500+ HP 427 Ford then knock yourself out on the ZDDP since that is what the additive was for.

05-28-2018, 09:25 AM	#33
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: Rotella Oil Question You have that right DD931. There is plenty of ZDDP in any modern oil for a relatively stock flathead. If it's a fire breathin heathin then maybe more might be better. 1200 PPM of the stuff is the max that does any good. More is not better. 800 PPM is plenty for a flathead. Now, if you have a 500+ HP 427 Ford then knock yourself out on the ZDDP since that is what the additive was for.