At my last oil change, my mechanic said I had quite a bit of gas in my oil. He owned a 2nd gen RX for a time and said it was higher than he'd ever seen in his. He said it is probably developing an internal seal issue.

What can I do?

 

change your oil more often.

other than that, you can try some seal swelling additives in the oil, like MMO, but they wont do much. as long as it runs good and doesnt smoke, i wouldnt worry a bit about it.

 

How did he "measure" the amount of fuel in the oil? My guess is that he just smelled it, eh? Well, some of the oils nowadays seem to smell a bit gassy, so send off a sample to Blackstone (www.blackstone.com) or some other lab and have them check it. That's really the only way to know for sure. The oil in my RX-8 smelled of fuel so I sent off samples of the last 2 oil changes to them and the amount of fuel in the oil was well below average levels.

 

As PAT said. If your motor flooded they will get gas in the oil. This is why it is said to change your oil immediatly after your car gets flooded.

 

^^ I understand this. But what happens when you're breaking your engine in and it floods like 3 times a week? Change the oil that many times? That would get costly. I only ask this because my 7 did this when I broke the engine in, and I didn't have the time nor $ to change the oil after EVERY flood.

 

The mechanic who said there was an unusually high amount of gas in the oil said he could see it floating on top of the oil when it ws drained....a blue color.

 

nah, a little bit fuel in the oil really wont hurt anything, the PCV valve will take care of most of it... if you think youre getting a lot of fuel in there, just change it every 500 or 1k miles or something until its fixed. in the case of a breakin, you should change it every 500 for the first 2 or 3k miles anyway

pat

 

If you have a T-II, this is normal. A few years ago, the folks at Royal Purple did some testing with Rx-7s. ALL turbo cars (2nd or 3rd gen) had gas in the oil when the oil was sent for lab analysis. In their testing, N/A cars did not have this problem.

 

JAPSPECGTUs - IMO You should have put the money aside knowing this factor for oil and change it as you are suppose to on brake in, no excuses.

 

Im at 270 miles on my brand new motor and I have a ton of gas in my oil...its crazy! Like the oil level actualy rose on the stick... So needless to say that oil will be dropped umm, tomorrow

 

On rebuilds that's typical, excessive blowby causes that, and when the seals aren't fully seated/worn in, blowby tends to be a bit high

 

fuel does not 'float' on oil, it mixes very easily. i think your mechanic was mistaken or mistook some moisture(which is also fairly normal in rebuilds) for fuel.

the only way it wouldn't mix is if the oil was cold, thick and the engine was not run prior to draining the oil and it was severely flooded right before the oil change.

 

i premix about 80:1 and get huge amounts of gas in my oil. the more oil i put in the gas the more gas i get in the oil...

 

^ you are mixing a little rich. It is rumored on rebuilt motors that are reusing irons that are within spec are getting this excessive blow by. The thought behind this is that the 2 cycle oil is causing a film on the irons. This is great for lubricant purposes but this effect as not allowing the side seals to seat fully on the iron allowing gas to blow by into the oil. The more oil you use as you are saying the bigger this film can become allowing more blow by.

A member Patman is using his own method of the RA premix. They are keeping the OMP but moding it to pump premix instead of putting it in the fuel. I personally have no means of testing these methods but in my conception this method may help reduce the premix blow by you are getting. Wayne88N/A I believe is changing his oil at like every 1,5000mi's due to this blow by from premix.

 

Shoot man,

I can bet that everyone here has a little gas in the oil. I havent had a rotary yet that didnt cause the oil to smell like gas.

 

ya i change my oil as soon as i notice it is about a half quart high. that way its not running too thin. i just cant argue with the power and gas millage i get from mixing rich... i have also advanced my timing about 30* to make up for the higher octane the premix makes so it burns it all out, runs awsome how i have it right now.

 

I would put that on a dyno and get some EGT readings, 30A is alot.

 

well its n/a so im not too worried about it, ive heard of people advancing 40*.

 

Are you serious? Sometimes it would flood twice a day! I mean i changed it like 5-6 times before I hit 1k, but that **** would add up, especially since I only made 7.25 and hour at the time, hehe.

 

I have the same issue with a 60k motor. I make the mixture 200:1 since I use the MOP as well. After 2500 miles my 20w50 gets about as thin as 5w30. I think it's a side seal issue with mine but it runs too well to do a rebuild. I still pull a strong 125psi per rotor face.

 

i run royal purple and it has a very slight gas smell when i drain it but not much.

 

Like a previous poster said, sight or smell is not going to tell you squat.

Fuel dilution is a common issue with all rotaries, NA and turbo. The only way to determine how far your particular brand and weight of oil can handle blowboy and fuel dilution is to send it into an oil analysis laboratory.

I particularly like the comment that a previous poster actually specifying the extent of fuel dilution and its effects on oil viscosity. Did he use the TASTE TEST to determine the shearing of his 20w50 weight oil to a 5w-30 weight oil?

All of you self proclaimed tribologists need to get some edumecation at www.bobistheoilguy.com They have a fair amount of used oil analysis results posted from rotary engine owners.

 

I mentioned that the dillution was close to 5w30. I sent it off to a lab. Can't remember which one, but it was in a kit that cost like 5 bucks. I did my own research as far as the numbers went and came to the rough oil weight conclusion.

 

I believe pretty much everyone who premixes gets this sort of blowby into the oil. I go 2k miles or so between changes, slightly less if I run a tank of, eh, "rich" premix (as in, 50:1 from accidently emptying almost an entire quart of premix into the tank for 13 gals of gas).

It's not something to really worry about. I just change my oil when I get a quart up.

-=Russ=-

 

Costs me 75$ including travel gas to change my oil. Not very nice to my wallet to only get 2k.