I use Valvoline VR 5W50,and my engine has 100,000 miles on the clock. not sure what the P.O. used,but the first thing I did,,(1,500 miles ago),was rebuild the head,(hardened seats installed),and bought new lifters. Just a tad bit more insurance. And I add a pint of ZDD,at every change,too,for the same reason.

Last edited by wetwilly5757; 09/27/2014 6:14 AM.
Just sold: 1955 2nd Series 6500 2-Ton Flatbed Truck
Mo' Tater
In the Stovebolt Gallery
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It takes an awful big dog to weigh a ton.