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04-17-2012, 05:27 PM | #1 |
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Got Oil Analysis Back
I just got my oil report back from blackstone labs:
The fuel % is over 2x normal, their comments say "could indicate a fuel system problem". What's a common cause for this? Copper is also high, which indicates wear at a turbo bearing or bushing.
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04-17-2012, 05:36 PM | #2 |
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lots of short trips, bad oxygen sensors, bad rings.
what kind of oil is this? |
04-17-2012, 05:42 PM | #3 |
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It's Rotella T6.
All the o2 sensors are under a year old, but I do take lots of short trips, mostly under 5 miles to the train station for work. |
04-17-2012, 08:15 PM | #4 |
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04-17-2012, 09:02 PM | #5 |
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This may sound crazy but every week take that car out for a long fun highway ride and burn some of that fuel out of the oil.
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04-17-2012, 09:30 PM | #6 |
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It's not like I don't drive it. I put probably 100 miles a week on it, and I go on the interstate every 1-2 weeks.
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04-17-2012, 09:36 PM | #7 |
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Wow, that Rotella is shot from the fuel! Did you take the sample or someone else? I don't think that I have ever seen a Blackstone fuel % that high and my trips are 7 miles each way.
Was the car fully warmed up? Did you do some WOT runs before taking the sample? If you want to really get to the root of the problem, and want a more accurate fuel reading, you'll need to spend more than $30 on a uoa. http://dysonanalysis.com/Dyson_Analysis/Welcome.html -Dennis |
04-17-2012, 09:40 PM | #8 |
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Yeah, I took at on my last oil change. The car was warmed up, I drove the to parts store to get the oil filter, and I took the sample in the middle of the drain. I didn't really do any WOT, but the car was warmed up, so I figured it was fine.
Last edited by zombor; 04-17-2012 at 09:53 PM. |
04-17-2012, 09:59 PM | #9 |
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Are you sure the O2 sensors were replaced? Are you stock? What fuel have you been using?
You can find various reasons for high fuel with a google search (all mentioned above). The copper is probably from the oil cooler but it's not that bad. http://www.bobistheoilguy.com/forums...Number=1683097 http://www.bobistheoilguy.com/forums...&Number=255524 -Dennis |
04-17-2012, 10:04 PM | #10 | |||
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Quote:
Quote:
Quote:
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04-18-2012, 12:46 AM | #11 |
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Fuel brand shouldn't really matter. Who's stage 2 tune? Some tunes and OTS maps are really rich to be safe. Not good for short trips (or long ones for that matter).
Could be a leaky injector too, but that will usually throw a CEL. That's some serious fuel dilution, like worse than a Gen I direct injected VW 2.0T. |
04-18-2012, 06:52 AM | #12 |
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The tune was by Matt Cater. Ive got an appointment with him this friday to look over some other stuff, I'll mention this to him.
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04-18-2012, 07:37 AM | #13 |
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(oops)
Last edited by bluesubie; 04-18-2012 at 07:45 AM. |
04-18-2012, 07:43 AM | #14 |
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This is what you want your uoa's to look like. The fuel is dialed in so well that even the Subaru synthetic stayed in grade. The last two uoa's are on RT6. I wouldn't go past 3k on the oil until you've seen that the fuel is normal.
-Dennis |
04-18-2012, 11:53 AM | #15 |
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I don't know Matt Cater, he's probably a great tuner, but you're close enough that you might consider pinging Jorge Carillo at P&L in Chicago on the matter.
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04-18-2012, 09:23 PM | #16 |
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id sell the car and buy an old toyota or hunduha beater and forget the subaru.....that kind of useage???
yer just killing the car......slowly and painfully what you are doing with the car is likely the WORST POSSIBLE THING you could do to it other than driving it straight into a wall at speed |
04-18-2012, 09:39 PM | #17 |
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04-19-2012, 12:47 AM | #18 |
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Well, I guess I'm behind the times a bit. Has he moved out of Chi-town?
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04-19-2012, 09:34 AM | #19 | |
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04-19-2012, 09:51 AM | #20 | |
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Quote:
It's entirely possible (and probable) that the car needs fixing. It seems excessive that some short trips (I do more than just drive a few miles per day on it, like I said) would end up with DOUBLE the average fuel %. |
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04-19-2012, 01:39 PM | #21 |
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Why is your magnesium so high?
Edit: My UOA of T6 also showed high readings similar to yours. NVM |
04-19-2012, 01:50 PM | #22 |
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They didn't mention that in the comments. Apart from copper, they said everything in metals was fine.
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04-19-2012, 04:44 PM | #23 |
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04-19-2012, 06:46 PM | #24 |
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Good to know
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