What's up guys? I'm a new member, I'm buying my first RX-7 tomarrow (2nd Gen '87) and my friend owns one. He was complaining that his car was suckin down the oil. So he took it to this mechanic that he really likes and trusts and he put in Valvoline 20W-40 in all his rotory motors he works on. Oil problem solved for the most part. Is this safe? Is it hurting the engine instead of using 10W-30?

 

20W-40 is good, because I use it. But Valvoline should not be used. It is not one of the better brands. Its ok, I guess, if you aren't into racing.

 

no it should be fine
lots of people (myself included) use 20w50

 

+1 for 20w50. Use what Mazda reccomends, theres a sticker on the hood or info in the owners manual. Going a range thinner may help cold starting in the winter.

Also +1 for NOT using Valvoline. Havoline was nice and clean for 3500+ miles, I've had Valvoline in there for about 2500 and it looks like crap.

 

Although it is expensive, I will go with royal purple. I changed to that and had an unbelievably better response in quickness and smoothness. I think they sell it on mazdatrix or racing beat, but I just buy it at pepboys.

 

i use castrol 20w-50 still amber at 3000 miles and that was during the race season

 

Isnt Royal Purple A synthetic tho?...I thought that rotories hate synthetic.

 

unless you did not remove your OMP then that statement is true.

 

No, its completely false. Under combustion, by documentation supplied by the manufacturers, Royal Purple leaves considerable less deposits than its dino-oil counterparts.

 

What weight oil do you guys recommend for cold winters here in Indiana? I'm picking up a 1984 GSL tomorrow.

 

I've used Royal Purple in All 3 of our cars: '93 RX-7, '95 "Stillen" tuned Maxima and my wife's '95 Toyota Corolla. Noticed seat-of-the-pants acceleration improverment only in the Corolla, just as the Royal Purple website predicted for small displacement piston engines.
Noticed faster throttle "tip in" & improved gas mileage in both the Maxima and Corolla.
The RX-7 showed only quicker spool up of the turbos by 100 to 150 RPM.
I feel the added protection the oil gives to both the apex seals and the turbo shaft is worth the extra $$ and the slightly greater amount of oil used compared to Mobil 1.