I have talked to the guys at rotory performance and they told me that only use synthetic in there rase cars and if I was to use it in a daily driver to change the plugs every 3 - 6 months, and to never use castol syntex.

 

You said it! - Mazda is in the business of selling new cars. To do this, they must develope a reputation for building good cars - part of that process is to keep the older ones on the road (Honda's been doing it for years)- and it makes for great "Free" advertising. Synthetic oil is not a miracle product - it is well know around the industry as being good for cars. If you are saying Mazda purposely devalues this product to sell more auto's or engines, I would say that's a little paranoid. Is it not more likely that they may be giving advice built on sound knowledge of the rotary engine? I don't know of any other car manufacturer who openly states they do not want you to use synthetic oil in their car - why would only Mazda do this, and only in their rotary engine? If you'll willing to discount their advice and use synthetics, IMO you're taking a gamble that could cost you a few thousand dollars. On the flip side, if the gamble is measurably worth it, I've yet to see any indicatores on this thread.

 

What should the flash point and Evap Spec's be on a good to excellent synthetic oil?

 

"The biggest liar in the world is 'They Say...'"

Denny

 

if in doubt, leave it out!!!cjf

 

i got no doubts here

 

I could see where your comming from. That mazda says its not good to put it in. Im still going to though.

 

If you are brave enough and have the cash to waist, use the new Castrol Syntec. Let me know your findings. If you do use Syntec...then start to have that problem...."oh ****, I think I threw an apex seal!", drive it home slowly. Drain the oil, clean your plugs, then add in real synthetic oil...like Redline.

 

I think I will go with mobil 1 0/30 synthetic not castrol

 

Okay.......just trying.

 

Castrol Synthetic sucks ****.

Even for pistons.

Ask Ivan the Mazda Mechanic with the FD in his living room.

 

I hear that...

I dumped Castrol Syntec in my Honda for a change at 155K miles, and it lost (Dunno where it went. No leaks, no smoke.) a quart every 2-3000 miles... Never done that before. I put up with is thinking I had ruined a seal, but decided to stick to the synth as the gas milage went up by almost 5 MPG. (Now I hear it was unwise of me to do this as it should have started leaking like a sieve.) Switched to Mobil 1 at the 165K mile mark and it's slightly overfilled, just like I left it after 3k Miles. And the gas milage went up yet again, although just slightly.