- Location
- Roanoke VA
Pennzoil use to make a 25wt racing oil that was really good for flat tappet break in. Not sure if they have it anymore or not but I have broken in two 4.0's on it and they are running strong.
EDIT: A quick search says that Penn no longer makes the racing oil I mentioned above but if you search for, "Flat tappet engine break in oil" (scroll to the middle of the page) you will find that the Lucas 30wt break in oil is highest in zinc and phosphorus
EDIT: A quick search says that Penn no longer makes the racing oil I mentioned above but if you search for, "Flat tappet engine break in oil" (scroll to the middle of the page) you will find that the Lucas 30wt break in oil is highest in zinc and phosphorus
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