Originally Posted by marcusvong (Post 3310354)

Mobil 1 said where? Can you please enlighten me?

Originally Posted by WTBRotary! (Post 3309557)

synthetics do not eat up Apex seals in the rx-8... The 8's seals are made up of a different matieral then previous Apex seals found in rx-7's etc. People are afraid to use synthetics in the 8 because of this and because Mazda says to use 5w-20 conventional... There's been tons of rotary rebuilds that prove 5W-20 is too thin protection wise. Plus Royal Purple has a FAQ on their website stating they have done extensive testing proving their synthetic is fine to use in a rotary. Synthetics are fine..

Originally Posted by monstermatt (Post 3311748)

Its on their website. This goes back to the fact that when mobil1 first came out it destroyed seals. Both the seals and the oil have been reformulated multiple times since then. I use Mobil 10W30 and have for +30K miles with no problems.

Originally Posted by Speedy_Guy00 (Post 3313151)

not because of different material... but because of tighter clearances kid... btw miss u guys... have a different number now so if you want it pm me....