If there was any hard documentation for any aspect of this never-ending debate, there wouldn't be 2000 posts in this thread. :yelrotflm

The service life of the Renesis is short enough that any benefit or detriment from synthetic oil is lost in the noise.

And there you are making the assumption that the owner's manual choices/instructions are made in the best interest of vehicle mechanical parts :)

You would be wrong. Certainly they try to, but for example why aren't coil changes listed at all in the scheduled maintenance? Maybe they didn't know at the time. Or how about any reference to redline or driving it hard? Lawyers and liability there.

All sorts of reasons why the "official" documentation for anything as liability prone as a car won't actually be the correct true story.

And actually, yeah, the owner's manual IS still on the internet :)

Your argument is flawed, if you choose to believe everything the manual tells you and recommends to the t, then by all means go ahead. Various people on the forum are and have been running synthetic fluids with no negative impact on the car whatsoever. On the other side, people running 5w-20 oil like the manual RECOMMENDS have seen pre-mature bearing failure due to running that thin of an oil. Why is it recommended? Like other said, for emissions reasons in the U.S only. Hence, why other weights are recommended in other parts of the world, for the same exact engine. Synthetic oils are a much better oil than conventional oil, and that is a fact. Many people believe it makes no difference and combusts the same as conventional oil, and does no harm. You can do whatever you like, no one is telling you to use synthetic. But your argument of believing what the manual tells you is ridiculous, RIWWP and others have brought up a good point that everything that is stated in the manual is not what the engineers are exactly recommending or what they would really recommend. Just like they cannot tell you that you should redline the car to prevent carbon build up because its a liability issue.

^Owned and Agreed +2

Aren't most synthetics now days just highly refined (hydrocracked) Dino oil anyway? If that is true then using a group III synthetic is just putting in really good Dino oil. The question should be what do group IV synthetics do in our engines?

I’ve read and been told that group IV base stocks create harder deposits than the others including I and II, but that doesn’t appear to be the case in this test and Id imagine that this has improved over time. Some group Vs such as the veggie derived will deposit more than a polyolester from what I’ve been told. Case in point on both of these is the Mobil 1 0w weight oils which while showing some deposits weren’t bad at all and they contain some Group IV and Group V (AN and maybe polyolester) by most reports.

What that means for us is beyond my ability to quantify but I’m inclined to think that this test is at least somewhat relevant.

I'm not actually arguing the point, merely saying I'd prefer to put my faith in the owner's manual and the car's manufacturer rather than in a bunch of random guys on a website, some of whom are assumed to have a godlike omniscience about rotary lubrication science. Sure I could be wrong, but so might you be.

First off :
https://www.rx8club.com/attachment.p...1&d=1349729750

You amused me.

and second :
https://www.rx8club.com/attachment.p...1&d=1349729750


and finally (for now) :
https://www.rx8club.com/attachment.p...1&d=1349729750

Strike out! Oh yeah,They are the one and ONLY company to have their car inside Mazda show room in Japan. I'm sure Knight Sports knows better than you! :)


and you do know that why we have OMP right? because the MARKETING DEPARTMENT SAID SO! NOT Engineering department.

I edited your post NYCGPS :)

Your valid passion doesn't always get recognized as such. No need to get personal.

NYC, take a breather man. No need to get personal. I really don't want to hand you something more serious.

I get it, i really do. Yelling at him won't change his mind and will only derail the thread.

Hey J cool it man...:)

Gee, I would like to close this thread...take a vote ???..

Just thinking out loud.;)

Let's Vote.

I'd vote, but what exactly would we vote on? "What kind of oil do you use?" Or "Do you think it's safe to use?"

It's still an opinion technically, so the discussion will always be open really. Just saying. :D

Posted From RX8Club.com Android App

Close the thread

I concur.

The discussion is over, shady has spoken.

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i concour close thread.

Has anyone had any experience with Amsoil Signature 0/30? I considered giving the Sustina 0/50 a shot, but over the past few days I came across a few threads where people sent in virgin samples to the labs and the numbers that came back were drastically lower than advertised. Little too expensive for my taste when it isn't as stable as expected.

Gunna be sending in a sample of the newer formula german castrol (the "SPT" series 0/30) to see if it does as well as its "older formula" did.

So far on my engine the M1 0/40 came back with praise from the labs.

lubrication
 

i have had my 04' 8 from 07' and have been using AC Delco supreme plus 5/30 , with specs API sl/cf ACEA A3-02/B3-98hash2/B4-02 . VW 502.00/505.00 . MB229.3 .
I only know the API 's relevance ,but i have had no problems with using this oil and an added bonus is the price at £24 for 5 litre can . Anyone else using cheaper oils?

and another thing , is the difference betweeen mineral and synthetic that syn's maintain their lubing qualities much longer than mineral oil's , and s far as syn's not burning off in the combustion chamber this should only change things on the exhaust side of the engine and i've not had any blue smoke out of the back of my 8 yet .

This might help?.

I have not used Amsoil , yet, I am at 2000 miles and ready to dump the Royal Purple and send it to "Lubrication Engineers INC. at 1-800-537-7683 if you want to reach them. They will due and engine oil analysis although we haven't worked out what I want from the test and I am open to suggestions as to what all to include in the analysis beyond the normal information. I am open to suggestions as to what analysis would be helpful to the thread that is specific to the rotory. My next 2000 mile test will be with Amsoil 5w-30. The royal purple is 5w-30. If interested I will post the official paper work they send me for the analysis of each brand.

Nothing to add to look for, but be sure to post the results in the used oil analysis thread.

F synthetic ! Itz garbage ! Cuz my friend's friend's friend's friend's friend's friend's neighbor's dog told me so ! Boooyea !