I've used joe Gibbs and the real deal leaded gasoline... The 79cc predator I've been collecting parts for has a decked head so it gets 98L... Even if the seats are hardened and the valves are stainless plus it smells like 1970... Should make an old school Briggs sing don't forget the cam and lifter assembly lube and the valve train likes it everywhere...M/T them old engines had a small cup there where he attached the tube, they had a steel wool type of filter, that you where suppose to clean once and a while. It was mostly meant to relive back pressure, but moister seemed to get the oil Rosado up and and seep out. Then they went to valve tappet cover venting, same thing there, you will always find excess goo on front of these small engines, unless you have really bad rings for ingress back pressure, I don't think there is chance of getting oil up and over his engine, let alone to the bearings.
That Brings up another subject OIL. These engines and most before 1995 are flat tappet, even cars, they took out the ZING additive that lubed these engine. Up until now I have been running Lucas breaking oil and STP in my oil for additive, I belong to https://www.casecoltingersoll.com// and there are some engineers on there, that have directed me to Diesel motor oil, that has the ZING in it. So now I just get 15-40 full synthetic Rotella. And if you are worried about cost you can run it for 2,3 years before changing...............Curt
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