umm im trying to do a tune up to make my rex run better, i bought 5 quarts of royal purple 5w-30, but im wondering whats best and what i supposed to use. plz let me know

tony

 

15-40 Weight Mineral Oil
stay away from the synthetic since the car is designed to burn oil
I have seen many posts regarding this - i dont buy the synthetic sh*#
one of my good friends has been a lead tech at a Mazda store and has
over 20 yrs experience - im goin by what he says

 

10W30 for winter
20W40 for summer

Castrol GTX non-synthetic is all I use.

 

10w30 winter, 20w50 summer castrol gtx is what i run, and you can run synt, mazda did in the 787b that won lemans.

 

10-40 royal purple

 

20W50 Idemistu
www.rx7.com

 

well i bought the 5w30 Royal Purple High performance oil, should i return it and get castrol ? i want my car to run as good as possible :s thx for everyones opinion

 

could i use the 5w30 for now, then ill order some of that Idemistu for next time?

 

Royal Purple all the way. Visit their website and look at the faq dedicated to using Royal Purple in Mazda Rotaries. mazda made that statement 20 years ago regarding the use of synthetics, and the advancement of oils in that time have been quite significant.

In my own opinion, Synthetic oil can be used quite happily if it is a HIGH QUALITY synthetic like Royal Purple. other than Royal Purple, I wouldn't use any synthetics.

 

before you waste money on idemitsu, read page 2 for a cost breakdown.

https://www.rx7club.com/showthread.p...light=idemitsu

 

Use Valvoline 20w-50. Run thicker oil to keep oil pressure up, gotta take care of the turbo's (FD or Turbo II). This is what Mazcare uses. They are the RX-7 guru's in the Southeast. Marietta, GA to be exact, just happens to be my hometown.

 

Valvoline 20w-50 in the summer. Bottle has VR1 Racing or some crap wrote on it. I use the regular valvoline 10w-30 in the winter.

 

Thats what i run in the Midwest

 

I use 20w50 Royal Purple ALL Season long because it doesnt get below 30deg F. 10w40 is known to leave a lot of carbon deposits. 10w30 is what others like to use.