AMSOIL is proven to combat the effects of fuel dilution better than mobile 1. Several analysis tests have shown mobile 1 to shear out of grade and drop viscocity at lower fuel levels than amsoil, with higher wear metal content as well. One thing I find strange is that we both run the SSO and both had a viscocity of 8.5 also yetI had far more fuel dilution than you did (4.1%). Have you added anything to your oil at all? This could have had an effect on your results. What kind of gas do you run? Any race gas? Any bizzare additives?

 

Dave, This "... The fuel run off programming (enrichment when transitioning from on throttle to off) is also unusually rich on the X..." is interesting. I asked Chris Black whether it would be advantageous to tune the X to higher A/F during warm up which I think is a critical period of potential fuel addition. What I got back was a, No. While I got no explanation I did note from another source that they (OEM)enrich to 11.0 during warm up, so if true, then there really is nowhere to go. That said, perhaps the "off programming" is an area to consider leaning out as you suggest.
I am going down to Sean Ivey in the near future to install FMIC and retune; will ask him if this is a possibility and likelihood of reducing fuel entry.

Later, Ken

 

That's odd, because after I switched back to Mobil 1 I don't have any of the weird effects that I used to. I am running a IX though, I just wanted to contribute to the fuel dilution thread. I haven't added any additives to my oil, no race gas nothing like that. I only fill up with Shell V-Power.
:edit: I'm also not running meth/water or w/e just normal shell gas and SSO oil (at the time).

Did you notice anything strange while you had the viscosity issue? I had a burning plastic smell coming out of the back of the exhaust, more smoke, and when I drained the oil there was a lot of debris in it etc.
:edit: but the debris turned out to be nothing, according to the oil analysis

Is it at all possible that additives in V-Power, when it gets into the oil, mix with any of the additives in the SSO, or whatever oil, to create some sort of precipitation within the engine?

 

Debris in the drain oil is not good. Was it metallic? Did you cut open your filter and inspect it for debris? Larger metallic fragments will not show up in a standard UOA. A UOA can be misleading in that way.

 

I don't think it was metallic. It looked like some kind of build up, when I rubbed it between my fingers it dissolved into almost nothing. I'm confused though, I'm back on Mobil 1 EP and the car's running 100% normal. I may drain it and send another analysis, and try amsoil atm 10w30... But this is really draining my cash =/

 

So what would you guys reccommend as for a fuel systems cleaner (keeping in mind possibilities of warranty issues?

 

Sent a PM to Eric Hsu, tuner and engine builder in Cali. While he has not had experience with fuel dilution he did say it "may be piston- ring problem" although the Mahle high pressure cast piston uses a "anodized top ring" design applied to other modern engines. He did note that "Many turbo engines dilute engine oil much faster than normally aspirated engines. The 13B rotaries and Nissan RB26 are notorious for requiring sooner than recommended oil changes due to fuel dilution." So the interim "solution" used in other turbo engines is what we have suggested for the 4B11, namely, change oil more often. Nothing new here but thought I'd pass it along.

Later, Ken

 

i do a same V=power + factory oil but extended one.

The turbo cars usually and should be comes with lower compression rate, but high cylinder pressure...
So these engine vs the N/A with high compression rate and no boost pressure shouldn't be a miracle it has more oil fuel mixture. Add on the Evo incredible high factory boost pressure vs other turbo cars...
I was thinking maybe the cylinder sleeve pulsation can cause some thing unusual , but since the IX looks like have a close or same "problem" that is out. Not to mention every evo i had, "suffered" the same black oil problem.

The Evos running like this since day one. Down to Evo !. I do not know the Evo engine how much faster is actually wear out then a N/A engine, but seems to me they hold up pretty good.

Specially if you think about the Evo 1-2-3-4 etc they still running strong on the street. I still dont see the issue being that big, it is worth this big fuss.
For me this issue really did fall the "Racaro seats cheaply made" problem category. Eventually that will be a problem too

 

I don't recall the rotaries having leaking rings...

 

 

You may be getting some internal deposits and sludge. How many miles do you have on your car?

 

around 34k

:edit:
I always made oil changes on time, always warmed the car up, cooled the car down etc etc.
I've followed maintenance with everything as well. In other words, I've been taking good care of the car, to the best of my knowledge

 

Alright guys,

I have been reading this thread for a while, but honestly haven't been to concerned. I think I have more miles on my X than most, so I will report my findings.

Background:

I only started taking samples after mitsu went into my motor to resolve an undisclosed problem (wanna remain anonymous). I immediately started hearing strange noises in my motor yet Mitsu claimed nothing was wrong. So to protect my legal rights, I started performing samples.

Attached is my latest report from Blackstone. You can also see my previous report findings in that report as well.

I can say positively that I have had no fuel dilution problems in the 19,000 miles I've driven my X.

I do however, have thining oil. This brings me to my next point. Should we maybe switch to this oil:

http://www.mobiloil.com/USA-English/...rformance.aspx

BTW...why is the EvoM file attachment size restrictions set to 100kb... I had to really lower the quality to get this pic attached?

 

our SSO oils have a lot of detergents to maintain the oil clean, if there was some build up in your engine which is a little hard to belive from you having an Evo IX they are fairly new came out in 2006.

that is one thing you will notice with AMSOIL oils they maintain your internals super clean, the oil bairly gets dark.


i called our tech service and we were brainstorming about your problem, because you had pm's me about it, and we could not com to an answer of why you would get these problems.

 

This looks good, very good! I am beginning to feel a little better, no alot better. Thanks TsiTalon for posting. Perhaps we have been looking at early engine break-in and associated fuel entry.
That said, I still think we should continue to submit oil analysis to verify that this issue will subside with some extra miles.

Later, Ken