Havoline 5w20
I ran it to 268k miles in the Explorer I traded for my RX8. Can't be all that bad. I don't have anything against synth. I use it in my wifes Mini Cooper S, but if I've got to pour in an extra quart every few tank fulls on purpose, I don't see the sense of spending that much extra money.

 

I use castrol GTX 5W20. I'm amazed that at least 1/4 of the people on this board know more about what kind of oil should go in the car than the Mazda Engineers. You guys must have done thousands of hours of double-blind testing on several engines?

 

Castrol 5W-20 change every 3000 miles 91 octane only

 

royal purple 5w-20 here. 23 mpg too.

 

Ditto this comment.

I run non-synth in both the 7 and 8. Mobil 1 in my other two non-rotary cars. Don't mind paying a little more if it can help save me big bucks in repairs down the road. Plus, I tend to keep my cars for longer than most.
Filled up with Chevron 92 today. Plan to start an additive soon too.

 

royal purple has a long write up on their website about why their oil is better for rotaries. I believe them.

 

There's definitely another side to that argument.

Many are going on past practices of using synthetic. And also on the word of several aftermarket sources that have a lot of respect in the rotary community. Look at it this way, Racing Beat has probably the best reputation amongst this demographic. Nothing they do is radical, but instead are relatively conservative modifications. For many, they're too conservative. For all their years of research and development, they sell synthetic for rotary engines. Mazda racing efforts have used synthetic for years, etc...

I personally could care less what anyone else uses. But I do use Royal Purple. The reason I do is because I have enough years of experience with using synthetic to be confident that it won't ruin my engine. And I trust some of the tuners that have personally recommended it to me. So it's really not me that thinks I know more than Mazda engineers.

 

I get 23 mpg with my regular oil the dealer puts in and I top off with Castrol GTX. I just got back from driving up to Seattle and back over the weekend and got 27 mpg and this wasn't all highway driving. I don't think your use of Royal Purple has anything to do with your mileage.

 

bump

 

What MazdaRich fails to understand is that the latest recall is for North America only.

The reason for this is two fold:

1) For emissions and fuel economy, they recommend and use 5w20 oil, which is too thin.
2) Also for emissions, they cut it too close with the MOP profile, and injected too little oil into the engine.

Other countries use 5w30. They do not have the NA recall. Other countries also have synthetic oil, they do not have the NA recall. Get the picture?

As has been pointed out before, even Mazda Japan (The company that put together your RX-8) says the RENESIS is fine with synthetic. The new o-rings are not harmed by it. See attached scans.

Mazda as a whole does not recommend synthetic for ANY of their cars. How many of you synthetic bashers can come up with a reason for Mazda doing this?

 

Im not saying that any of us knows more than Mazda engineers, but we're just showing our side of the story, we use it and we got no problems, so what makes you, or people who had never/hardly use synthetic oil can say its bad ?

 

I thought RG said it best when he said that the reason Mazda doesnt come out and say "Use Synthetic Oil but dont use XX Brand because its bad" is because they'll get sued the moment they do. So instead of saying that they just say dont use ANY synthetic oil, its much safer that way Legaly for Mazda. And I agree with that.

 

Royal Purple 5W-30.

 

It's in the manual, the quick tips hand out, and the DVD!

 

what year?

beers

 

because as soon as you put the evil synthetic oil into your car, god is going to hate you because you side with the evil and you're going to be punish.

oh well, my car has yet to die, I have 20K miles !

 

Wait if you put Synthetic oil in your car your evil! WtF why didnt someone tell me this sooner!!!
Putting Synthetic Oil in next oil change.. meh evil might as well keep the trend going through my car

 

this whole syn vs dino is just comedy now. i cant fight anymore now i just laugh....

it is doug stanhope vs dennis miller...

and to rodgerdoger. i am impressed. you found this site... read the owners manual and quick tips, and watched the dvd... in 4 days.....

you are so ahead of the game... i see no SEARCH replies in the threads you start...

you might upgrade your profile... i had to work a bit to find out you got a shinka.

and welcome.. btw, are from ny??? and yes i see el paso.

beers

 

dude it is a cult... the cult of evil...

beers

 

Royal purple 5w30 is your answer.

I use it without problems.

Now bite me

 

My 06 has the "not recommended" everywhere! LOL

 

I have Royal purple everywhere !

and my 8 is going everywhere ! (without problems)

Recommend -
Pronunciation: "re-k&-'mend
Function: transitive verb
Etymology: Middle English, from Anglo-French recommender, from Medieval Latin recommendare, from Latin re- + commendare to commend
1 a : to present as worthy of acceptance or trial <recommended the medicine> b : to endorse as fit, worthy, or competent <recommends her for the position>
2 : ENTRUST, COMMIT <recommended his soul to God>
3 : to make acceptable <has other points to recommend it>
4 : ADVISE <recommend that the matter be dropped>


Against -
Main Entry: 1against
Pronunciation: &-'gen(t)st, -'gin(t)st, -'gAn(t)st
Function: preposition
Etymology: Middle English, alteration of againes, from again
1 a : in opposition or hostility to <spoke against his enemies> b : contrary to <against the law> c : in competition with <racing against each other> d : as a basis for disapproval of <had nothing against him>
2 a : directly opposite : FACING <she sat down just over against me -- Daniel Defoe> b obsolete : exposed to
3 : compared or contrasted with <profits are up against last year>
4 a : in preparation or provision for <saving against an uncertain future> b : as a defense or protection from <a shelter against the cold>
5 a : in the direction of and into contact with <knocked against the ropes> b : in contact with <leaning against the wall>
6 : in a direction opposite to the motion or course of : counter to <sail against the wind>
7 a : as a counterbalance to <weighing risk against profit> b : in exchange for <a lower rate against the dollar> c : as a charge on <charged against her account>
8 : before the background of <viewed against the sky>


Sorry to say but, how many people here are actually not even Junior high school grad ? forget about the non-recommend part. why do people some people always want to ignore facts from actual user (like me and tons of other people) but choose to believe what Mazda lawyer's said. on the other hand, they put aftermarket parts into their car, totally ignore the fact that Mazda against those.

 

I am not denying that some people are doing fine with synthetics. I agree with RG that "some" of them cause a problem, which would prompt the blanket statement to use none. Since my oil changes are totally free to me at my dealership every 3000 miles I really see no need to spend a lot more money to tell them I want synthetic put in my car, especially since there isn't a problem using regular oil.

My car has no aftermarket parts either.

 

just recieved RP today here's my thread:

https://www.rx8club.com/showthread.p...68#post1563068

so for those who have issue with the "not recommended" oil,it's a MUST

 

Mobil-1 0w-30 Super Syn for 17000 miles.