Quote Originally Posted by mustanghammer View Post
I am curious as to how long you guys go between oil changed? We, myself and an E Prod driver, change oil every 8 heat cycles.

We have always used 20w/50 mineral or 15w/50 synthetic wt oils from Valvoline and Mobil 1. Both seem to be fine in terms of heat and pressure. On recomendations from several engine builders - Tony Riveria, Jesse Prather - we don't use low viscosity oils.

Regarding increased ZDDP levels, I can certainly see the value for an oil the contains zinc in a solid lifter piston engine. I wonder if there would be the same concern/value in a rotary engine. I can't really think of a bearing surface in a rotary that is similar to what you have with a lifter and a cam lobe. Where do you guys see the value in ZDDP??
Scott...I ran the syn. oil specially made for RX7's last season. The name is Idemitsu and it's the same Japanese brand that helped Mazda win their class at LeMans in the 90's. Made for rotaries and you can by it online from Mazdatrix.