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Old 04-17-2012, 05:27 PM   #1
zombor
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Default 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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Old 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?
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Old 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.
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Old 04-17-2012, 08:15 PM   #4
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Quote:
Originally Posted by zombor View Post
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.
HOUSTON...WE FOUND THE PROBLEM
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Old 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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Old 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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Old 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
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Old 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.
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Old 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
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Old 04-17-2012, 10:04 PM   #10
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Quote:
Are you sure the O2 sensors were replaced?
Yes, I did them myself when I replaced the exhaust components.

Quote:
Are you stock?
Nope, stage 2 tuned.

Quote:
What fuel have you been using?
91-93 octane, depending on where I get gas. Are you asking the specific brand?
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Old 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.
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Old 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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Old 04-18-2012, 07:37 AM   #13
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(oops)

Last edited by bluesubie; 04-18-2012 at 07:45 AM.
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Old 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
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Old 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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Old 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
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Old 04-18-2012, 09:39 PM   #17
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Quote:
Originally Posted by gpshumway View Post
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.
im 99% sure he isnt with them anymore.
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Old 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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Old 04-19-2012, 09:34 AM   #19
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Quote:
Originally Posted by bluesubie View Post
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
OP, I should add that I do far more short trips than I let on in those UOAs^^. I drive 6 miles to work and frequently go home at lunch. So that's 6 short trips per day, or more. The long highway trips on the weekends really help with fuel dilution, as others have mentioned. Though in your case it looks like your tuner needs to spend some time on fueling.
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Old 04-19-2012, 09:51 AM   #20
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Quote:
Originally Posted by Uncle Scotty View Post
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
Don't be stupid.

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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Old 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
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Old 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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Old 04-19-2012, 04:44 PM   #23
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Quote:
Originally Posted by b1aze View Post
Why is your magnesium so high?

Edit: My UOA of T6 also showed high readings similar to yours. NVM
Yup, T6 uses lots of magnesium as a detergent/dispersant additive.


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Old 04-19-2012, 06:46 PM   #24
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Good to know
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