Hello RX-8 owners. I'm new to your club. I've owned my 2007 RX-8 for 1 month now and have already put 2800 miles on it. I've been reading this thread with great interest. It's now about 3 years running and I think I've read nearly every post. Seems that the premix debate was pretty hot at once and now this thread appears to be posted in by those who premix and those who are inquiring about it, like myself.

First, let me say the originator of this thread, OMCWankel, did premix starting at 800 miles. I noted he discontinued posting in this thread after stating he'd post his engine oil analysis results using a product from LC. So I tracked down his posts and learned his RX-8 died at 49,000 miles, an early death for sure. He sounded like a maintenance enthusiast, so it'd be safe to assume his died for reasons other than lack of maintenance.

After tracking him through his other posts, I came to the conclusion that this thread needs a compilation of results. May I suggest that a method be agreed upon so that we can compile and make some sense of this information. Can we compare fuel economy of all members who use premix and those who don't, for example, for starters?

 

Can we compare fuel economy of all members who use premix and those who don't, for example, for starters?

We could, but there is a huge disparity in mpg, even between non pre-mixing users, so any conclusions would be based on very flawed data.....


S

 

omc wankel barely posts but errr... just ask people such as rotary god and look at the post, problem or renesis revealed or something.

rotorygod have owned alot of rx's so he knows a thing or 2, considering that the 09 engine design remains the same except the addition of 1 more oil injector, we can be sure that the engine is not being lubricated enough as it currently stands and should premix a little to help it go.

 

I'm not ready to concede that just yet. We've seen some high-mileage Renesis tear-downs now, and many of them show very low wear levels. It appears that if the OMP works flawlessly, the engine does in fact get adequate lubrication. I'm thinking that the third injection port may be insurance for those instances where extreme conditions (temps, dirty or old, compromised oil, blocked filter system) and a less-than-100% OMP conspire to starve the engine for lubrication- and even then we may be talking about a very long-term condition that is slow to do damage in 99% of cases.

That said, I personally believe in erring on the side of caution, especially with a $30K investment, so I do pre-mix, using Idemitsu, at one-half the recommended rate.

 

On the flawed data comment, well perhaps. It may not be a safe assumption that a cross section of driving is represented by both those who premix and those who don't. And I'm not saying that such a list would result in a conclusion on this subject.

However, for example, I've read in this thread that Petit racing (sp?) uses a premix and then shows one engine where it was used and one where it was not. Now that is hardly conclusive. Two engines do not represent a large enough sample.

Another example is the assumption that one should use premix because racing teams with lots of experience do use it. I'm no racer, so I don't tear down my engine after a long day of using it. Which leads to another question about using premix because racing teams do. My style of driving, while agressive, is still just street driving. Stop and go, long runs at 75mph, short bursts to 8000 rpm. Agreesive, yes, racing no.

All I'm suggesting here is a compilation of data. That data might start with fuel economy and grow to include other factors.

 

There's alot of things to conisder, like stealth said, to get accurate fuel mileage data. Altitude, ambient air temperature, humidity, manual/automatic, engine mods, tires/tire pressure, etc etc etc

 

fuel economy depends on

1 you live in the city, drive in the city. mpg sucks
2 you dont live in city, and for most of the time your are not in traffic. mpg does not suck.

3 you spend a lot of time on the highway, keep mph below 75 mph. mgp ~ 21-23 mph.

beers

 

Well, I'm sure I have at least one Irishman somewhere in the woodpile, but I think my good FE numbers are because of 35 psi tires, no short trips and a conservative driving style.

Latest fillup: 320 miles required 13.2 gallons of the usual 91 octane Chevron, 10% ethanol. 24.24 mpg

2nd tankful using at least 6 oz MMO oer 10 gal.

I'm not sure I can attribute any efficiency improvement to MMO, I use it mainly to keep the internals clean.

 

dang.. u must drive at 60 mph, i can see that number only if its 95% highway with 60 mph.. just not possible in houston -.- u'd get run over.

 

so i have a question; i do not premix but do you fill up then pour the 2 stroke oil into the tank? or do you have to mix it before you put it into the tank. Like for a 2 stroke dirt bike? Because i am curious how people do it, do they just carry around the oil in there trunk or what?

 

I read this entire thread when I was a new member. I learned from the experienced members to keep a bottle (or bottles) in the trunk. Start filling up your tank with gas- to ensure the pump is operating- then stop and add the premix of your choice, then continue pumping. This also ensures your additive mixes well.

I was using Idemitsu at 8oz per fillup but was concerned about excess carbon buildup so I lowered it to 6oz per fill (13 gallons). After reading Jax comments and some other net research I switched over to MMO to try it out. I'm on my 3rd tank and it looks like I'm going to see a 1-2MPG increase, which is surprising- so I'm withholding judgement until my next trip to the station (not that I don't believe you Jax, I'm just a skeptic at heart ). I will say that the engine runs as smooth as when I was using Idemitsu, which is definitely noticeable over not premixing at all. I'm also glad MMO is a good cleanser, makes me feel better about it than Idem.

[EDIT[ Lastly, I added half a quart of MMO during my last oil change.

 

I was using 4oz of MMO. I'm now using 8.

Jax- is 8oz per fillup the right amount (13 gallons per fill)?

I also added a bit more to the engine oil. I only used half a quart with my last oil change. I added another 16oz or so. This stuff seems spectacular. I removed the baffles and 1 screen from my intake, added a K&N drop in and installed the Revi air duct. Between that and the MMO my car runs smoother than ever. It's an '07 so I haven't had much time with it, but there is no doubt all of this has helped. The difference is highly noticeable.

 

After reading all these premix threads, I just have one question about these products I got today. Is it good?





This is the culmination of all my rx8club-reading premix knowledge. There is Amsoil Saber Professional coming in the mail, but this is all that is available locally today.

 

Perfect.

S

 

does not suck. mine is close to that..


beers

 

I'm not too sure you need to pre-mix anymore with the AP.

If you do.... it would be 2oz not 4oz.

 

good point. if you have the ap.

but if not..

i will always add 4oz.. and a cleaner..

to use a great line.

do you really feel lucky? punk!

beers

 

Sure! I sure do! U betcha...
After a few I feel lucky.

You want to make something out of it?

Ha ha............... Are you ever gonna make it out to 7 Stock Swoope?

 

this year has a bit of a glimmer!!!

beers

 

if u want a good premix that improve ur rotor engine then go here https://www.rx8club.com/series-i-tech-garage-22/best-engine-oil-premix-rx8-rotor-engine-142534/

 

wow,

shameless promotion??

but i will say great stuff.. add a bit more. brilliant...

thx jax!!!!

beers

 

All 4 of his posts are the same. :

 

Yes, more than the standard dose (4oz to 10 gallons), but we need to extra lube and cleaning.

 

I used MMO on my first and second tanks of gas this week on a long drive 100% freeway... the first tank I added 16 onces, set the cruise control at 80mph and saw NO difference in gas mileage, I got exactly 18.6 mpg, on my next fill-up, I added 8 more ounces, and set my cruise control at 70mph and boosted my mpg to about 23 or so (I'm at a 1/4 tank and have 250 miles on the odometer, still haven't filled up yet...). my guess is that MMO didn't do anything to help my mileage, but 10mph made a HUGE difference... I bought 3 32oz bottles of MMO so I'll keep using it at least until it's gone but I was hoping for the same effect as 2cyl oil... ie, boosted fuel economy... who know's maybe the MMO did make a difference in conjunction with slowing down, only time will tell for sure... I've actually been thinking about getting the new 2009 RX8 when it is available for order in a few months (new look, 4.11 final drive=better acceleration), but in all honesty, with this fuel economy and gas prices on the sharp rise... I may be buying the new Supra instead... 400hp, 400 lb ft tq, gas/electric hybrid with over 30mpg (I know that Toyota keeps denying that it's coming, but I just stopped working for Toyota, and it IS coming, 2 versions, a Toyota hybrid and a lexus version with a V10)... I adore my rotary but $62 dollars to fill her up hurts when it's only gonna get me 200mi... if she had a 20b it would totally be worth the mileage sacrifice! I wish for a MAZDASPEED version with a NA 20b (or turbo, but I imagine that would make it pretty pricey)...that would be sweet!

 

Is Castrol 2T motorcycle oil safe for Cat.?

http://www.castrol.com/castrol/secti...tentId=7040924