Going in for first oil change
11-15-2007, 03:18 PM
#31
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Interesting. My 1st UOA showed a Fuel percentage of 2.3%
That was on the dino oil with only 1 track day which was a couple of months before the oil was drained. In other words the was not much opportunity to burn off fuel in the way that you described. The second sample on the other hand had 5 track days in which I ran the car very hard and the oil sample was taken a day or two after the last track day. The oil in my car now has only one track day and that was almost 2 months ago. I'm curios what the fuel percent will be.
What would cause fuel in the oil? I did replace an o2 sensor a couple of months ago. Could it be related?
What would cause fuel in the oil? I did replace an o2 sensor a couple of months ago. Could it be related?
11-15-2007, 07:30 PM
#33
That pattern exactly fits what what I described. Are you running a CEL, custom fueling?
I can't say if that new O2 sensor is working right, maybe you are running default closed mapping???? Fuel dillution can come from a lot of things. Short trips? >2% is insane.
11-15-2007, 07:47 PM
#34
Renewable Lubes BioSYN Double-Super-Secret RS4 Racing Oil.
Made for fuel dillution in FSI engines. 15 page thread, I'd read it backwards.<ul><li><a href="http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=893022& fpart=15">http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=893022& fpart=15</a</li></ul>
11-15-2007, 07:53 PM
#35
Here is a lab UOA from a TT 225 w/Mobil 1 TDT. Pretty good stuff.
<ul><li><a href="http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1019919#Pos t1019919">http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1019919#Pos t1019919</a</li></ul>
11-15-2007, 08:10 PM
#36
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The O2 sensor was replaced right before the last UOA.
There never was a CEL. I pulled the code after I bought a VAG COM. I told the dealer and they replaced it under waranty. I ran 93 octane pump gas from Shell or Cheveron usually. I don't even know what default closed mapping is.
I'll wait and see what's on my next UOA. If there is a Fuel dillution issue it should show up again since I have not been on the track lately and my driving is 50/50 hwy/city and never more than 30 min.
I'll wait and see what's on my next UOA. If there is a Fuel dillution issue it should show up again since I have not been on the track lately and my driving is 50/50 hwy/city and never more than 30 min.
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