Hi im actually a DSMer but i jus recently purchased a 2004 mazdaspeed rx-8. And i wanted to do the oil change. Now for my DSMs i usually use Mobil 1 racing oil (really thin stuff).....can i use that in the rx-8's rotary? If Mobil 1 will not suffice can someone please recommend a brand and thickness i should use for best performance? Also if you could also lemme know which oil filter brand and stuff is the best for this car.......and just to make sure before the first time i do it....there arent any "special" oil procedures a rotary needs is there? THANKS IN ADVANCE!!!

factory says to use a good quality mineral oil, and just change it on time

I don't risk synth personally, 5w20 is what the filler cap says, but I haven't been able to find any, period. Now I just use 10w30, runs fine. Castrol GTX.

vavoline VR1 race oil 20w50 weight

thanks guys...i really appreciate all the info



as for the 20w50.......that wouldnt b too thick? i want good performance but still perfect streetability

I honeslty don't know anything about the RX8 but i've ran 20w50 in my FDs for the past 2 years with no problems. The heat of the rotary tends to thin the oil faster anyway.

id go with what they recommend for the rx8, they do want a thinner oil in there than they did for the previous cars

They use 0W-20 here in Japan for the 8, only place to get it is from Mazda. I beleve it is a semi-senthetic, so I'd be looking for a durablend in the 5W-20 range, but Castrol 5W-20 should work just fine if you can't find a semi-synthetic.

I am not too happy the local mazda put in 20/50...



I'm thinking more like 10/40 would be a good number.. or 15/40..

I used 20-50 in my FD. It was just fine. And you are right the heat from the rotaries thins out the oil much faster. The important thing is to change it on time.