actually gas caps can fail, that's why they check them when you go through emmisions.
but there is no way the premix cause the CEL to come on

 

Ok, thanks guys. The light has been on for a few days now after re-tightening the cap twice, so maybe something else is going on. Car drives fine. Just odd that 5 years as a daily driver, the one tank I put premix in triggers a CEL. Maybe I should buy a lotto ticket.

 

Go to Autozone have them check what the code is.

I have a CEL that poped up for no reason a month ago, its a P0420 (if Im not mistaken), seems I have a bad CAT.

CAT's are known to fail out of nowhere.

 

And they're covered under an 8 year warranty, right? I have the Racing Beat exhaust - gotta make sure the dealership doesn't void the warranty over that.

 

Start by figuring out the problem... then worry !

 

If you go back to the start of this thread, you will see that it is common practice for many RX8 owners to use motorcycle oil and 2stroke oil as a premix. You can add whatever you like in your gas, its your car. The oils mentioned above and Marvel Mystery Oil(when you work on bikes for 3 yrs, MMO doesnt mean marvel mystery oil ) are just fine in moderation. No one knows what the "best" premix is. We listen to opinions, have some debates, and settle for what sounds ok.

 

you need to clear the codes.. I would just suggest taking off the positive battery wire for 30 mins for so.. put the wire back on start the car turn the wheel all the way to the right all the way to the left so the DSC and TCS can get adjusted again. Then let it warm. you should be good.

if the light comes back on after a few miles then you take it into a shop. always do your own diagnosis it saves time and money.

 

I have read through the whole thread, but I think you're going to either confuse people around here or continue to be misunderstood if you try and insist that MMO does not mean Marvel Mystery Oil around here. That's just been the common usage here. Personally, I don't use MMO 'cause I like the fact that Idemitsu was designed for rotary usage.

 

I would get the codes read before you clear them. Autozone can do that for you.

 

our autozones in CA don't do the free program anymore. you need to buy the device. its just a big hassle.

if the problem is still there after you manually clear the codes then the CEL will come back again.

if its not then it will not come back that simple. clear the codes and see what happens.

 

I'm not insisting that MMO does not stand for Marvel Mystery Oil. I misunderstood what others were referring to since I used that abbreviation for something different since MMO doesnt only refer to one thing.

Any way, I have been thinking about getting some Idemitsu and was wondering if others would be interested in trying to get a group buy going for it. Once we get a headcount or a general idea, we can get it approved my the moderators. PM Me if interested so I can get a head count and see if the savings would be beneficial.

 

I suspect most of us may be getting Idemitsu for $55/case from Mazdatrix. Definitely interested in a group buy if you get it approved.

 

I'd be interested if I didn't already have a case of it. It'll last me a looooong while.

 

do you mix anything else with your idemitsu...i forgot :P

 

Yes, FP+. Hasn't changed in the last couple of days.

 

Though I have started to wonder whether the FP+ makes a difference or not. Course I'll use it while I've got it, just wondering. What if you used some gas that boasted detergent qualities such as Shell V-Power, or this new Invigorate nonsense from BP? Or are the levels of detergent they use extremely weak and useless?

 

and last questions and i'll stop bugging you...how much fp+, 1 oz?

thanks! you've been a big help.

 

I'm not that precise. On average, my fill-ups are about 13 or 14 gallons. I have 5.25-6.0 oz premix bottles, which I fill with anywhere from 1.5 to 2.5 oz of FP+ and the rest Idemitsu.

 

I think detergent gasolines are very good, eg, Shell V-power, but they don't really help with lubricating the apex seals. FP+ may actually help to lubricate while it cleans. Only way to know for sure how well it's working would be to take apart some engines and compare. I just trust some of the age-old ideas for what works with rotaries and listen to those who seem to know what they're talking about.

 

Yeah I use 8 oz bottles with something like 1-1.5 oz FP+ mixed with 4 oz of Idemitsu. I'm not all that precise with the FP+. Just a splash.

I suppose you may be right about the FP+ doing a little lubricating, but if we are throwing in Idemitsu anyway, how much additional lubrication could it possibly be adding... Meh, no way to really tell, so I'll just keep at it. Not like we're spending a fortune on premix supplies.

 

It so much that it adds lubrication but rather that it cleans without harming oil films as some cleaners do. The fact that the carbon might be changed from something negative into something positive is also an attractive idea--ask me again in 175k miles and I'll let you know how it works out.

 

Unfortunately, I started premixing kinda late, around 45K, hopefully not too much damage was done before I started. I'll be doing a rebuild at some point, so I guess I'll see how screwed up my housings and rotors are.

 

I pulled the battery and the CEL turned off. However, after 30 min of hard driving, I stopped and turned off the engine. When I turned it on a few minutes later, it started for 1/2 a sec and then died on me. We'll see how she behaves in the future.

 

I have emailed a few places to see if it would be worth doing a group buy for Idemitsu Premix. I am awaiting quotes. Where do you buy your Idemitsu? <-- Anyone answer please.

 

Mazdatrix

I think most of us get it from there.