Inliners International Forums General Discussion Engines New cam. Should I spring for roller lifters.

XEA,
It is an oil additive. It has zinc and phosphorus essential for flat tappet/engine break-in. I've done a lot of research recently and discovered that the new API approved oil standards got rid of zinc and other additives vital to older engines. They did this because all new engines have 1. catalytic converters and 2. use roller lifters. The zinc in the old oil could, over time, clog up and eventually distroy the cat. The rollers eliminate the need for zinc and phosphates.
EOS is a GM product still in production for older engines for an assembly lube and
break-in, some people add it to every oil change.
If you google GM EOS you'll get the part # 1052367.
I've found that Valvoline VR-1 (their racing and off road oil has the most ((I think)) ZDDP available except for maybe some diesel engine oils).
I am going to use the manufactures lube and EOS for the break in of my new cam and lifters and VR-1 for my oil from now on.
Bill
Inliners # 1783