Dont you guys think that Mazda doesnt recommend to use Synthetic becasuse the catalytic converter will get plugged up sooner??

 

Who cares!!! Bottom line guys, DO NOT use synthetic oil in your 8's. It will void your warranty...but if you're still confused then use it and see what happens

 

Can this discussion please die?

Mazda developed and built the rotary engine in this car. You didn't.

Mazda has stated (NOT IN THE OWNER'S MANUAL) not to use synthetic. This is clearly stated in a Driver's Guide that comes with the car, in the DVD that was sent out last month, and in email correspondence from Mazda USA to people who have inquired. If you feel this is not 'valid' because it's not in the owner's manual, then act accordingly.

Mazda has NEVER said that NOT using synthetic would cause a problem.

Some oil manufactureres (who have a vested interest in selling you oil) say that it's OK to use synthetic oil in a Mazda rotary. They did not develop or build the Renesis.

Some oil manufacturers (who have a vested interest in not getting getting blamed for whatever may happen) say not to use their product in a Mazda rotary. They did not develop or build the Renesis.

What self-proclaimed petrochemical experts on this board say is meaningless. They did not design, build, test or warranty the Renesis.

What Mazda motorsports/racing info says about using synthetic is meaningless - an engine intended for track use cannot be correlated to real-world use. If you think so, how about installin' a restrictor plate on that there Renesis carburettor. NASCAR uses 'em, so must be good enough for your Mazda, right?

Likewise, who cares what oil Mazda spec's for non-US markets? For those in the US market, with a US warranty, you follow US guidelines. Would you remove one of of your oil coolers just because non-US cars only have one oil cooler? If this is where you live, and this is the model of car you bought, deal with it.

Here's the compromise:

There are people here who are rabid about synthetic being OK. Let them use synthetic if they want. It's their car, their money, their judgement, and their consequences if something goes wrong. Don't try to convince them otherwise, it's not your car and doesn't affect you in the slightest. Let them do what they want, and everyone else STFU.

There are people here who are likewise insistant that Mazda has spoken about not using synthetic. Let them use conventional oil if they want. It's their car, their money, their judgement and if something goes wrong they are well within Mazda guidelines about oil types. Don't try to convince them otherwise, it's not your car and doesn't affect you in the slightest. Let them do what they want, and everyone else STFU.

Everyone, please quit freaking asking the same question that has been discussed to death already! Synthetic oil discussions should be subject to the same prohibitions as street-racing stories - lock the thread/delete the thread/instaban the offender(s).

 

There's a handy spot to carry a spare bottle right under the hood, no modifications necessary, nothing in the trunk. Fits my choice of oil perfectly, YBMV (your bottle may vary).

Edit: Added this to the DIY forum - https://www.rx8club.com/series-i-do-yourself-forum-73/diy-extra-bottle-oil-under-hood-58217/#post820174

 

Use Royal Purple Synthethic. Racing Beat has been using and selling it for years and that's good enough for me.

 

Royal Purple is great stuff, no doubt... but you'll still have to change it every 2500 miles... and it is pricy. For normal driving, IE, you don't track your car, stick with dyno juice.

If you are hard on your car, and/or want nothing but the best, then go with RP.

 

How are they going to prove it unless you tell them? There is absolutely nothing wrong with running a good synthetic oil in a rotary. I've been doing it for years.

 

The holy bibel (Original Mazda Workshop Manual for the RX-8) say nothing about dino oil.





HDP

 

Nice ! I always preached (j/k, the "holy bibel" above is guilty ) for the use of higher grades in US, at least in summer. And now there is proof from Mazda too that a car in NE winter should use a different oil grade than one in FL summer! Next oil change is 10W-40 for me I already replaced the oil filler tube cap with aftermarket so that I don't see the 5W-20 every time I open the hood I'll run 5W-30 in winter next time (maybe I'll see the "fuel economy" the 5W-20 claims to help drop even lower, one never knows.... )

 

I was planning on just using 5W-20 as spec. in Manual and by the Dealer, year-round in southern California, using Motorcraft 5W-20 as was filled at the dealership I bought my 8 from.
Also, standard procedure for checking oil is a warmed engine that is shut off for at least 5 min. (to let oil return to the pan). What about checking the oil first thing in the morning (i..e. from a cold engine?) Would this be adequate, or should engine be warmed up first??

 

it says it in the RX-7 ('93 to '95) manual

 

Um, 10 years ago, different engine . . .

 

Amzoil is a synthetic that i use. 1 it guarantees if your engine fails they will replace it. And for you racers yes they make racing oil.

 

silly newb

 

Oh lort. This is a hell of a thread to bring back from the grave.