The synthetic though will live a lot longer. Though with those service intervals the gears and synchros seemed to live ok. With the premium mineral gearbox oil I had been using before I changed it every meeting and it always came out burnt. It changed nicer and did not come out stinking either. Just before I stopped racing that car I went to synthetic in the gearbox. Oil does not solve harmonics! Previously at half that km the bearings were decidedly marked and had lost some 'spring' too. The engine at 2500 race km when pulled down had bearings that were suitable to go again. Oil temp was consistently down over the 25-50 mineral race oil I had used before. ![]() This on a fresh rebuild when first started with synthetic. In my Sports Sedan engine when it was rebuilt with about 1.8 thou oil clearance I actually had to put a softer spring in the pressure relief as it had too much oil pressure. Take more heat and conversely produce less heat.įor 20 plus years I have used synthetics. While I am no oil chemist synthetic oils are normally better.
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