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Old 10-26-12, 06:41 PM   #1
TonyT
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Default another oil consumption thread

This has to be my second one yet.

On my first time. I ran the Subaru oil consumption test. It show I had a bad turbo. It was burning oil. Got a new turbo well used. Did the swap. The car definitely pull and ran smoother.
It's about 3K miles since the turbo swap.

I wasn't burning oil at first. (about 3 months) But I also wasn't running full boost. 9psi. Turns out the pill resistor was causing it. Or lack of. Fix that.

Running full boost and now i'm seem like i'm loosing oil again. I'm wondering if i have a really bad blow by going on. I haven't pulled the IC but I'm betting there a some in there.

Top it up about a 3 weeks ago racked close to 600miles and lost about .3 to .5 of a quart

I think i'm going to be pulling the pill again, Running back at 9psi to see if i'm consuming any again. If i'm not, i'm betting I need a new PCV valve or Crawford A/O separator.

Is anyone else who went or is going through the similar thing can shine in? that would be awesome.

TL;DR people..

* Had a bad turbo causing me to consume oil.
* Swap turbo, running low boost, no consumption
* Losing oil on full boost.
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Old 10-27-12, 01:34 PM   #2
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I always burn more oil on trips. What oil are you using (brand and weight) and is it the same oil you've had since the turbo swap?

-Dennis
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Old 10-27-12, 01:40 PM   #3
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Default Re: another oil consumption thread

How did the consumption test show a bad turbo?
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Old 10-27-12, 05:11 PM   #4
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Quote:
Originally Posted by bluesubie2 View Post
I always burn more oil on trips. What oil are you using (brand and weight) and is it the same oil you've had since the turbo swap?

-Dennis
Amsoil 5w-30 yes it has. I've been using it pre turbo swap and after. Same weight and everything.





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How did the consumption test show a bad turbo?
It what subaru has conclude.
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Old 10-28-12, 12:26 AM   #5
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Would you think that a dirty motor eg like lots of carbon build up cause it? I know going on a drive after my oil change, my oil is getting dark.

I've read a few thing about have carbon can cause compression lost. That would be even across the board correct? Eg 145 on all four pistons vs 140 on 3 and 120 on the last.
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Old 10-28-12, 06:21 AM   #6
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Default Re: another oil consumption thread

Quote:
Originally Posted by jdblock View Post
How did the consumption test show a bad turbo?
Quote:
Originally Posted by TonyT View Post
It what subaru has conclude.
I understand that. You didn't ask how they came to that conclusion? Obviously it was wrong if the engine is still showing oil consumption.
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Old 10-28-12, 12:01 PM   #7
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Default Re: another oil consumption thread

Quote:
Originally Posted by TonyT View Post
... I know going on a drive after my oil change, my oil is getting dark...
I think oil "getting dark" quickly after an oil change suggests blowby (past the rings) into the crankcase.
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Old 10-28-12, 12:25 PM   #8
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Quote:
Originally Posted by swr999 View Post
I think oil "getting dark" quickly after an oil change suggests blowby (past the rings) into the crankcase.
Dark oil means it is suspending contaminants from sticking to your motor. If your oil comes out as clean as you out it in. Its not doing jack shit. Why do people think dark oil is bad

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Old 10-28-12, 12:46 PM   #9
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Default Re: another oil consumption thread

Quote:
Originally Posted by jdblock View Post
I understand that. You didn't ask how they came to that conclusion? Obviously it was wrong if the engine is still showing oil consumption.
Well the turbo does run smoother now so I'm guess it was the also the turbo at fault to and it actually boost compared to the old one.

Here a quote from one of the techs

"subaru would have pulled your intercooler off and most likley seen lots of oil in the intercooler, which is a sign that your turbo is blowing oil past the seal. its easy to swap the turbo out.
the only other reason you would be blowing oil is if the seals in the head are shot, leaking, or the rings in the short block are cooked. so lets hope it just your turbo lol."

Quote:
Originally Posted by swr999 View Post
I think oil "getting dark" quickly after an oil change suggests blowby (past the rings) into the crankcase.
Interesting. I was thinking of that too. I have nothing again "dirty oil" it's doing its job. I just find it strange for my oil to be that dirty that quickly. A 20m drive to the grocery store and it's slowly turning brown.

Would an air oil separator help? I'm looking at the Crawford one. I don't feel like aimless spending money on parts that may or may not help get me to the end of it.
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Old 10-28-12, 01:06 PM   #10
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Default Re: another oil consumption thread

It could buy you some time.

Sometimes cracked ringlands don't show up on a compression test. So you might still have issues down the road. Did you get the compression checked?
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