Originally Posted By: artificialist
Does it cover rotary engines? Apex seals are oil lubricated by injecting some oil into the fuel/air mixture, and don't last.
I once had an RX-8 come in with almost zero compression after 130,000 miles, it got 3000 mile oil changes with PYB
All Mazda Wenkel (Rotary) engines ingest some motor oil into the fuel/air mix to lubricate the apex seal, and the lubrication requirements for rotary engines (I date these info back into the 80s where RE Amemiya (Jpn Mazda wenkel engine tuner/specialist) had a special blend motor oil around 10W40, but is ester based. This is custom blended to reduce apex-seal chattering and yet provide sufficient lubrication to keep the engine going and yet the oil+fuel+air mix still burns clean in the exhaust stream.
Unfortunately, I no longer has those info with me (remember: I collected these info in brochure form back in the 80s, guess that's 30yrs ago).Otherwise, I would have recommend it to you.
It's a sorry state to see Ford tried to influence Mazda in their technical dept as far as lubricant requirements and needs, which deviated from what the original design called for, citing Mazda 121 (Festiva) gear box lube: original factory spec. calls for something like SAE 70W80 but many Ford stealerships would use ATF instead. Guess why those bronze synchro goes so quickly?
Ditto with engine oil types/specifications for Mazda wenkel engines?
Q.
p.s. glad to see that my favourite oil brand (Idemitsu) still provides custom oil for rotary engines:
http://www.rotorsportsracing.com/performancetuning/idemitsu.htm