Has anyone had any problems finding the correct oil for their RX8? My dealer still does not carry the correct weight of oil despite the supposedly factory trained mechanics and service?

 

what oil are we sposta use?

ive just been using 10 w30 mobil 1 ?

 

5W 20

 

no wrong for your own sake stop 5w20 is what the oil cap and manual says, anything else may get gunked up (10W30 is thicker i believe), you risk damaging a lot of internal components in the long run with incorrect oil

 

5w 20 is the spec oil but it is not easy to find, unless you really really search...

 

God, don't you people read the manual?

Anyway, dauntless, I found 5W-20 in Walmart. I also bought a case of it online. Just do an Internet search if you can't find it locally.

 

loco,

thanks for the post and will do that, last check with walmart was a no but will keep on, thanks again..

 

some good discussion about 5W 20...


http://www.canadiandriver.com/articl...0engineoil.htm

http://www.oil-tech.com/5w20.htm

 

2 more links

http://www.speedstreet.org/forums/sh...0563#post70563

http://www.thebestsyntheticoil.com/5w20.htm

 

I find it everywhere. I usually go ro Pep Boys or Aid Auto Stores.

 

I was able to find a case of Castrol GTX 5w20 at Pep Boys.

 

I thought you weren't supposed to use synthetic oil with rotary engines because the engine burns a little oil as a normal part of its operation and it can't do that with synthetic

 

As the CanadiaDriver article points out the 5-20 is primarily a trick mfgs. use to get slightly better fuel numbers. Dodge has stuck with 10-30 as they care more about engine life. For the RX8 a 5-20 would be better in cold ares as it will pump though out the engine faster when cold starting. WHen hot the 30 weight is probably better, but the difference would vary more by engine and oil temp than the weight of the oil. If you run real hard in Nevada with temps over 115 then the 30 or even 40 weight would be best.

Check what NASCAR or other racing groups use in their engines and you will be surprised with 50 & 70 weight engine oil to handle the high temps and loads.

The rotary is much easier on oils than most engines. There are no blow by gases entering the crank case and hense less acid and other things building up in the oil. Chevy was planning on having the automatic trans and rotary engine useing the same oil system before they canceled the project (remember the Vega and the large transmission hump?) Mazda was really being conservative since the rotary has not been out in years and with a new customer base in requiring 7000 mile oil changes.

 

Kragen/Schucks/Checkers, Autozone, Pep Boys, Napa Auto Parts, etc.etc.etc. Theres tons of em all over California to say the least, and I've never had a problem finding 5w20. Granted they might not have the specific brand of oil you're looking for, but they always have at least one brand available in 5w20.

 

its 5W-30 for our europian cars...

 

ken, yoroshiku...

found some today at traget, just came in last week, said they dont usually order, pep boys said yes indeed, come on by...

thanks

 

Yes, I have heard the same from multiple sources. Synthetic apparently does not burn off like its non-synthetic counterpart. My mechanic emphatically stated "do not use synthetic in an rotary".

KMart carries 5w20 as well. It's a lot more common than I thought.

 

I bought my 5-20 castrol gtx at auto zone.

If you use Synthetic motor oil in your car you will burn out your muffler bearing, J/K.
If the book says it's bad Don't use it.

 

found 5w-20 very easily at pepboys and at autozone... ::shrugs::

 

as you can see:

 

Exactly. So where in the owners manual does it say that Synthetic is bad? Exact page number, please. I'm asking because MY owners manual says absolutely nothing about not using synthetic. It specifies oil of 5W20 viscosity that meets API SL spec, that's it. If you want to use a 5W20 API SL synthetic oil, then it's meeting Mazda warranty requirements and is perfectly fine to use.

Regards,
Gordon

 

What's wrong with 5w-30?

 

Nothing, actually. I strongly suspect that 5W30 would be better, long term, for the engine. Mazda North America specifies 5W20, but everywhere else in the world Mazda specifies 5W30 for the RX-8. It's widely assumed that Mazda NA spec'd 5W20 for a very imperceptibly slight improvement in fuel economy - a known Ford and Honda trick.

Regards,
Gordon

 

you can get it at advance/auto zone/wal-mart/k-mart all have mobile 1/ 5-20w

 

My dealer put in 5W30 at last oil change and I have a few quarts of 5W20. Is it OK to add the 20 to the 30?? Also I got reflashed on June 12 Part# N3H6-18-881A. Anybody know which flash I got??