Amsoil technical bulletin on the Renesis.
 

Didn't know if anyone had seen this.

Interesting, but kinda funny. They criticize the lack of scientific proof on the other side of the argument, but then they offer none. They bring good points but still we don't really know what exactly is happening....

Interesting article and thanks for sharing.

I read both papers (the Mazda's paper too) and I like how they spent probably hours and all they can come up is "oh, we're not sure if Synthetic oil actually cause this cuz not all Synthetic oil are created equal(no shit), and use non-genuine oil might cause this(yeah ok, they better don't leave that part into any of the manual or risk of being sue)"

hmm ok, so they're calling MOTORCRAFT garbage is "genuine" oil? cuz that's what they're.

and funny crap is, I wonder what kind of study they did over it (they didn't specify) , cuz Mazda Japan sells Synthetic oil and we all know they just rebadge it from something else.

on the test, if they test "crap" synthetic oil, of course it's gonna be bad.

good stuff for sure

Do they say that they guarantee it won't cause damage? And that they'll cover the engine if Mazda does not? Or go to bat in battling Mazda?

Not that I think there's a problem with using synthetic, other than cost and overkill if you change at regular intervals. But if they're going to put out a bulletin like this they should stand behind it.

It's my understanding that more recent owner's manuals say that synthetic should not be used.

Ken

I am going to break in my new Renisis engine on Amsoil XL 5-20 and continue to use it there after.

Do you have page 2 of this bulletin?

It's right next to page 1.

Don't cry when your bearings fail.

Zoinks! viewing on my phone... optical illusion, appeared to be one thumbnail to me.

Why would the bearings fail nycgps?

I am considering the castrol 0W30 for mine. Looks like good oil to me.

here is an awesome concept....just use what the manual says to use...

No synthetic for my new Renisis engine.
 

So, after looking at the new RX8 Mazda owner's manual, I will not be using synthetic oil.

Idemitsu Synthetic Rotary Engine Oil
 

www.idemitsu-usa.com/page_207.htm
Rotary Lubricants
These formulations have been specifically engineered to meet the unique requirements of a rotary engine. The technology base for these formulations goes back to the first and only 24 Hour Le Mans race winner using a rotary engine for which IDEMITSU developed the winning oil.

Product Description


Idemitsu Racing Rotary Engine Oil 10W-30
(Full Synthetic)
Formulated Specifically For High Performance Rotary Engines
Contains Special Molybdenum Agents to Reduce Friction, Which Increases Horsepower & Torque
Improved Sealing Performance
Minimizes Exhaust Port Clogging
Superior Shear Stability
Exceptional Wear Protection & Durability

Idemitsu Racing Rotary Engine Oil 20W-50
(Full Synthetic)
Formulated Specifically For High Performance Rotary Engines
Contains Special Molybdenum Agents to Reduce Friction, Which Increases Horsepower & Torque
Improved Sealing Performance
Minimizes Exhaust Port Clogging
Superior Shear Stability
Exceptional Wear Protection & Durability



Rotary Premix
Product Description



Idemitsu Racing Rotary Fuel Lube (Premix)
(Synthetic Blend)
Designed For Use In Gasoline Engines Only
Improved Sealing Performance
Provides Additional Wear Protection For Apex Seals, Side Seals, etc.
Keeps Fuel Injectors Clean For Reduced Maintenance
Minimizes Exhaust Port Clogging
Reduces Friction
Application: 1/2 oz. Per 1 Gallon of Gasoline

Interesting article.

Just look at some of the engine tear down threads here and then make an educated decision on oil. FYI, different dealers use different brands of 5W-20 so if you think there is some standard dealers go by in terms of which oil to use then you are wrong. I took pictures of the oil tanks behind two local dealers and one was using Mobil Clean 5000 and the other was using Castrol GTX.

Also remember that due to the way 5W-20 is formulated to withstand testing, finding a 5W-20 that is not a semi synthetic oil is pretty hard if you are using any of the major brands. As Stealthtl pointed out in another thread that they use semi synthetic base stock in order to make an oil that will last long enough to pass the testing needed to meet standards. There are even dealers that do synthetic oil changes.

There is no final answer for you guys, more important than oil weight/brand choice is how often you change it. Pick an oil, get it tested, see how it does and go from there.

That said, I have used Mobil1 0W-40 for most of the life of my current motor and I used Castrol GTX 10W-30 in my last motor (lasted 74,000).

i use amzoil with no issues.