Could be, but I believe carbon deposits from the oil burnt in the combustion chamber would account for a fraction of what may come from low quality fuels with no additives.
Considering most racing teams run race oils with race fuels (with few cleaning additives), and most have experienced next to no carbon deposits, I wonder if this is more related to operating the engine at very low speeds for prolonged periods (as Druck, one of our UKOC members suggests).
I have been running mine from the second top up of oil with PAO semi-synth oil, and switched to PAO fully-synth 12k miles ago and I have yet to experience any negative side effects.

I do want to keep an open mind and will observe this thread, but considering I am on the track next weekend, I don't really fancy going there with an under performing oil...

I would appreciate if Mazda published the research that led to the TSB rather than just issuing a blanket statement that could be mistaken for a hoax of international proportions (as it has been for a few days in the UK)

 

Mazda makes big money on parts too!

 

I have read that MNAO is close with Mobil but their synth is not good for the Renesis. Can anyone shed some light on this? RG?

 

Mobile manufactures a mineral only oil, the "5000".

May I dare suggest that this may have something to do with oil drain intervals?

In Europe (don't know about Australia), oil is changed only once every 12.5k miles (20k kms).

 

i think this is more of the same as we saw in the CD here (never have seen it myself) and we have talked about here for years.- its spelled out clearly in the UK bulletin- Mazda does not recommend any oil it hasnt tested. that has been the basis of the stance from the begining- Mazda will not spend the Money to test every variation of synth and semi synth onm the market. since there has been eveidence that there can be issues it is cheaper for them to say "dont use them" then to bother with all the testing to weed out the specific ones you shouldnt use. Its a "CORPORATE" stance not a scientific one- the science would cost them more than they are willing to spend.

on the flip side- here int he states because of the issues in vegas et al, the dealers are now required to send an oil analysis of the brand they buy for use in their service departments so mazda can approve or not the use of that brand and weight. so it could be there is an additive they are wary of....

 

The DVD that comes with the 06s? You can watch mine.

 

Hmm, My dealer (University Mazda) used to use Chevron oil, but recently (last 6-12 months) moved to Castrol. Could this be why?

 

dealerships use bulk oil from one vendor.... it changes due to the price, getting a deal...

beers

 

https://www.rx8club.com/showpost.php...2&postcount=74

i had to work to find that one!!!!! btw, thx rg.

beers

 

It says the owners' manual will be revised. Then in the very next sentence it says the owners' manual will not be revised.

 

The new cars will have their owners manuals revised. Cars already out the dealership door won't be revised.

That's the way I read it.

 

Yeah, that's way too long, IMO.

Here in Australia the oil changes are due every 10,000kms (6000 miles).

 

funny,

how the marketing works..... in the usa every 3k miles or you are DOOOOOOMMMMMED....

i have been doing every 5 k miles.... and have no more or less problems...

btw, that ambrose guy can drive a truck... go figure..

beers

 

I think we should focus on why Yamamoto states Mobil 1 is the worst synthetic to use in the rotary. How much different can Mobil 1 be than Royal Purple? They both use PAO for base stocks. So other than different amounts of additives they are very similar.

However, I would also point out that we assume RP is a group IV. This is controversial and it is felt by members of BITOG that RP is actually a hydrocracked group III. Nowhere, is there a product spec sheet listing the base oil used in RP, not even on RP's website, in fact, RP will not say what they use. If this is the case than it would make sense why RP is safe in rotaries, that is because RP is actually a highly refined mineral base stock.

 

I think they mean until a future model comes out, not for the current model year.

 

In Europe is every 15.000 kms (9300 miles)

 

Royal Purple is a Group IV PAO. I've been there and had a tour of the place. They have no problem saying what it is. It is not a Group III.

 

I'm sure they can say whatever they want, but that is not going to fly. How do you know it is not a group III? because they told you so?? Can you produce a document? Fact is there is no such documentation from RP. Yeah, I'm sure they can say all kinds of BS during a tour.

 

These guys make an oil scan for 45 bucks, maybe someone interested can pay them to analise one of the RB oils they sell (or probably they already know):

http://www.rotaryart.uk.com/acatalog...otor_oils.html

 

That's probably on the higher maintenance schedule.

Regular maintenance is 20.000kms (12.5k miles). At least this is what my European service manual says, and what my dealer does.

 

bump

 

RG: blah, blah, blah.

Raise your hand if you think a mere consumer knows more about rotary engines than the company that produces them.

But you know, some people will defend their false statements to the grave.

 

valpac: blah blah blah.

Raise your hand if you think a company will mention not to use x company product due to lawsuites?

But you know, some people will blindly believe any corporation despite decades of testing, by the manufacturer themselves, and other aftermarket companies. Though its funny that the type of product the company tells the consumer to use, causes the same issues.

I think I will go with the company that has done the most research and testing on said subject. Looks like Mazda is one of them...

 

While I don’t feel I know more than Mazda Engineers I think I might know more than their Lawyers. Please explain why Mazda recommends 5w-30 everywhere else but North America where 5w-20 is the rule? Could it be that some other part of Mazda overruled the engineers? As posted before Mazda cannot say one brand of syn is better than another so it’s easier to just say no to all of them.

 

Dont know why the diff in viscosity between US and Australian cars. The service bulletin does state that Synthetic oils/blends are prohibited in all Mazda rotary engines...

I'll say this, corporations have agendas and Mazda is no different than most. It is your choice whether to believe lawyers dreamed up this bulletin to "cover their ***" and mitigate potential lawsuits or Engineers drafted this sb because they have tested synth oils in rotary engines and found them to be detrimental. Why risk it? Your choice.

I really hate reading statements from self-professed experts on this forum that say "using synth oil is fine". Such statements are irresponsible in the face of mounting evidence to the contrary.