Hi Guys,

Read enough about debats on synthetic and Mazda mineral oil.

I see no issue changing to full synthetic or semi as the rx8 has the upgraded O-rings and it was the pre-renesis that had the issues with using full sythetic or sythetic blends.

NOW, can't seem to really find any reviews on the above oils on these forums but more so debates "syth vs mineral"

I'm definately changing to Sythenic but anyone with personal recommondations on the below?

Will definately be using either one of the 3!

Royal Pruple 5w30 - Sick smell???
Catrol Edge 5w30
Mobil 1 5w30

 

Check http://www.bobistheoilguy.com/

More info than you could ever want to know about oil.

 

Thanks for the link mate I'll have a search on the link.

But still open to others opinions and feedback on the above oils. Thanks

 

Mobil 1 is good. RP is good too, but more expensive I believe. Don't know anything about Castrol Edge.

I personally would go with the Mobil 1, as you can get good deals from Pepboys and Autozone (5 quarts + K&N oil filter for like 30), but I like the color purple.

That and because I want to go 0W40, so I have to go with RP on that one.

 

Hey JenDesu,

Thanks for feedback, I ended up going with Mobil 1 5w30 API SL ILSAC GF-3.

Castrol Edge has different grades which does not meet the owners manual. I think API SM? Can't remember

Did the change today, car feels alot smoother. I got the OEM oil filter but I'll probably get K&N next change.

Need the extra protection of Synthetic oils in the summer time here in Australia.

 

https://www.rx8club.com/showpost.php...6&postcount=16

Searching IS your friend... will you still use mobil 1?

 

Do some more searching and you'll probably stop using Mobil 1. From what I've read, anything that is FULL synthetic will be fine: RP, Redline, Amsoil, etc. Personally, I'd stick to those 3.

 

This isn't really a review of the oil being used by a forum member?

Again the pros and cons of sythetics. I deceided to use sythetics but wanted a review from someone who has personally used the oil in an RX8/

The reason why I choose Mobil 1 is because the oil grade meets the owners manual requirements. API SL and ILSAC GF-3. 5w30

Castrol Edge is a different grade, I didnt check Royal Purple. Plus the link you gave me is research and opinions about sythetics"a decade ago?" We are talking about the Renesis engine not the 13B, 12A so forth. Like I've said I'm going sythetics and dont need any more convicing.

Thanks for the link and advice to "search" I have used the search and did not find what I wanted, which was a "REVIEW" on a forum member who has used either of the above oils.

 

If you are NOT using a Sohn adapter or otherwise injecting 2-cycle into your motor I wouldn't use Mobile1 for the fact that it's been communicated to me by people I trust to not be one of the best synthetics for the RENESIS.

Does that mean it's bad? Not at all. No doubt it is because the synthetic properties don't make it prime for burning inside the combustion chamber. While I was using standard OMP injection I ran Royal Purple 5w-30 because RP stands firmly behind their product in terms of rotary engine use. IIRC they have a whole section on their website devoted to rotary engines.

RP is fairly easy to get a hold of as well.

I can't speak too much in terms of direct effects of the RP 5w-30 but I did run it for nearly 50,000 miles. No issues to speak of during that time but I didn't perform any testing but I did oil changes every 3,000 miles. I did notice quite a difference when changing the oil out so I do not know how much of the additive package was left. I see no problem in anyone using it but testing would be best to determine your change intervals.

 

I will use Mobil1 0W-40 after my next change but I am using a SOHN adapter and the only reason I'm switching is because the UOA of my Castrol GC 0W-30 wasn't great. Take everything we say with a grain of salt you hear on this board and do your own research. RP is good but costly and I don't thin Castrol Edge is a true synthetic either. But more important than your choice is that you change whatever oil you decide on often and on time.

 

Thanks for the feedback really appreciate it, I'll do a search on Sohn Adapters and if this is crucial for the RENESIS in order the use Mobil 1 oil I'll reconsider my oil choice next change.

I noticed your Avatar is a series 5? Are you using RP in it? Or when you say you used RP for nearly 50,000miles in this on an 8?

 

Totally agree, thanks

 

If you are not worried about the price you cannot go wrong with RP 0W-40.

 

No, that avatar is actually my RX8. Yes, you're correct that those 50,000 miles are with my RX8.

I do suggest the Sohn adapter to anyone that is willing to undertake the installation and the (possible) warranty consequences. I waited until my powertrain warranty was up before installing it. The adapter allows you to run a seperate oil injection tank which I run 2-cycle oil. 2-cycle is meant to be burned unlike 4 cycle motor oil and thus has properties more in line with what the engine needs.

The upside is you can run whatever oil you want in the crank case without worrying about whether it burns well. The cost is about $120ish including the 1 quart tank which I ordered from American Plastics.

I'll have to check out those UOA's as I nearly switched to that oil. I agree that any feedback the OP gets in this thread is going to be VERY limited in facts. Without proper testing no one has any idea what is really happening in their motor and no clue how well their oil is performing.

 

OP - is there a reason you are so stuck on Mobil 1? There are lots of other good synthetics to use where you don't have to use the Sohn adapter.

 

Other good Synthetics where you don't have to use Sohn Adapters?
Ie RP?
Any others that you would say are good synthetics and do not require SOHN Adapters?


And are these Synthetics API SL and ILSAC GF-3? The description of FULL SYNTHETIC is abit broad? Labelling, Marketing? Isn't the grade of the oil most important? Hence API SL and ILSAC GF-3.


Mobil 1 meets exactly the required grade in the owners manaul. No where in the manual does it say "DO NOT USE SYTHETICS"? Only states "RECOMMENDED Mazda Oil"


I'm not defending my choice but just want see why would you say one SYTHETIC is better than another?

 

There is no synthetic that would make the SOHN unnecessary. The SOHN is just a device that allows you to inject clean premix (NOT DIRTY ENGINE OIL THAT IS NOT DESIGNED TO BURN) No synthetic motor oil stacks up as good as a synthetic premix and rightfully so because synthetic motor oil is not designed to be burned and synthetic premix is.

 

I can see it now, my eyes playing tricks on me. I swear it looked like a rx7 series 5!

 

Since ILSAC GF-3 has been around since 2001 I don't have any reason to suspect that these synthetics would not meet that requirement.

The issue is the fact that no two synthetic brands of oil are alike. Mineral oils for the most part all share the same base stock of oil and as such the only difference between them is their additive package. Synthetics are designed from the ground up with specific characteristics in mind and thus they tend to differ from brand to brand.

The "grade" as you describe it is simply a certification or rating. Most oils meet the API standard rating but the base stock of oil tends to be the most important followed up by the actual additive packages.

 

I see what you mean with Synthetics not being made to burn and the requirement of the SOHN adapter to inject clean premix to be burnt.

But why has Mazda not essentially stated in writting that "DO NOT USE SYNTHETICS OIL AT ALL"

I'll read more and try and get a better understanding of this all. I want to use Sythetic oil to provide better protection for my engine in the coming Aussie Summer.

 

Well because all synthetics are different and they have no way of testing them all in the rotary so its easier to say just not to use them. For all we know some may not be good for the rotary. they are recommending one in Japan that they claim is specially formulated but who knows. Premix directly injected is the best bet IMO.

 

*white flag* I will use vegetable oil now LOL.

 

Really it all depends on how long you plan on keeping teh car. If your the type that changes cars every couple of years then just run a decent synthetic and premix in the gas.

 

Thanks again, without a SOHN adapter which syn oil would you use then?

IF you HAD TOO use one and you couldn't pick RP! lol

 

Well, that's tough to say but Eneos, Redline, Amsoil, then maybe Mobil 1, GC.