To maybe add to the questions and controversy about oil in our old engines,a while back I changed mine to Mobil 1 10-40 High Mileage oil.This is an engine with around 10,000 miles on a re-ring job.So far no indications of any problems.This past weekend a 950 mile trip at interstate speeds with the A/C on in 95 degree high humidity weather,it ran a little cooler than ever before and even with the valves set at .022 the engine is silent at idle.Anyone have any thoughts about the use of a full synthetic?

 

Paul,

Boonville,MO