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Old 07-26-2013, 03:08 PM   #1
trentsize
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Default Losing nearly a quart of oil in 500 miles

I recently switched to Rotella T6, fixed all boost leaks with new silicone hoses, and replaced the PCV valve. After the last 500 miles I had to put in nearly 1qt of oil to bring it back to full. Over the 3750 OCI, I've had to put in ~3 qts. What's the deal? I had very little oil in the intercooler, and no other visible signs of leaks other than the oil cooler gasket which I'll replace this weekend. No smoke at any time, including on start up or out of the oil filler cap.

I do a lot of heavy mountain driving, going up steep grades in 2nd, 3rd, and 4th with boost. The majority of the mileage is still 55mph highway. I don't go WOT often, just a few times over the last few thousand miles. Is this just normal for this type of driving?
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Old 07-26-2013, 03:22 PM   #2
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how many miles? my wrx has 136x and i use t6 and go thru about 1 qt every 1000-1500 depending on how i drive. pcv system needs replacing on my car in the near future. that and subarus like to eat up oil a bit.
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Old 07-26-2013, 03:33 PM   #3
trentsize
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It's around 116,500.
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Old 07-26-2013, 03:43 PM   #4
2gnt2wrx
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Was it happening before you replaced the PCV?
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Old 07-26-2013, 05:01 PM   #5
trentsize
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Quote:
Originally Posted by 2gnt2wrx View Post
Was it happening before you replaced the PCV?
Yes, it was burning oil then too.
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Old 07-26-2013, 05:16 PM   #6
2gnt2wrx
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Check for external leaks, valve covers and the plastic crankcase vents usually leak on both heads.
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Old 07-26-2013, 05:21 PM   #7
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Checked the downpipe / turbo hot side housing??

My 2002 wrx was burning around a qt every 750mi and it turns out that the turbo seal had gone (noticable by oil in DP/hot side), and the pistons were pretty worn down and letting a lot of oil blowby (compression test/oil level dropping)

Get a compression test / leakdown test / and check the downpipe turbo connection.
-------
I finally rebuilt mine; polished crank, ACL bearings, new stock pistons, piston rings, bored and honed cylinders, rebuild heads to stock, rebuilt P&P TD04, and all new hoses, gaskets...ect...various odds and ends...

3000 miles later after break in - not even a noticable drop in oil level. I do have a small valve cover gasket leak tho, very minor. Currently running conventional Rotella for another 1000mi before switching to T6
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Old 07-26-2013, 05:30 PM   #8
trentsize
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Quote:
Originally Posted by Gmfergione View Post
Checked the downpipe / turbo hot side housing?? My 2002 wrx was burning around a qt every 750mi and it turns out that the turbo seal had gone (noticable by oil in DP/hot side), and the pistons were pretty worn down and letting a lot of oil blowby (compression test/oil level dropping) Get a compression test / leakdown test / and check the downpipe turbo connection. ------- I finally rebuilt mine; polished crank, ACL bearings, new stock pistons, piston rings, bored and honed cylinders, rebuild heads to stock, rebuilt P&P TD04, and all new hoses, gaskets...ect...various odds and ends... 3000 miles later after break in - not even a noticable drop in oil level. I do have a small valve cover gasket leak tho, very minor. Currently running conventional Rotella for another 1000mi before switching to T6
How much did your rebuilt end up costing you?
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Old 07-26-2013, 05:34 PM   #9
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I thought oil seal leaking in to the exhaust would be very apparent?
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Old 07-26-2013, 05:54 PM   #10
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I think around 2500~ give or take

-Machine work was 350$ for bore and hone cylinders and polish crank, and machine work for rods.
-330$ for the stock pistons from mastriaparts (great subaru parts website!)
-100$ for the oversize ACL bearings
-595$ for full head rebuild by a local guy i know
-150$ for the master gasket kit on ebay (with valve cover gaskets)
-300$ down to 200$ for a rebuilt turbo P&P from a guy on ebay (got 100$ back for core exchange)
-75$ to replace a torn turbo inlet
-10$ per head stud - i needed 2-3
-various odds and ends to make the job work prolly around 300$

As for oil in the turbo, it was very unnoticable for me! I never saw smoke coming out of the exhaust - but there was oil all over my downpipe and in the turbo housing.
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Old 07-26-2013, 06:31 PM   #11
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It could very well be the leak around the oil cooler. It seems insignificant at first glance, but it only really leaks oil when running the engine, so you don't really see how quick it is leaking out.

I just fixed mine after having a pretty quick rate of oil loss (1 qt/~1000 miles) and it seems to have fixed it.
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Old 07-26-2013, 08:12 PM   #12
trentsize
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Quote:
Originally Posted by jonno View Post
It could very well be the leak around the oil cooler. It seems insignificant at first glance, but it only really leaks oil when running the engine, so you don't really see how quick it is leaking out. I just fixed mine after having a pretty quick rate of oil loss (1 qt/~1000 miles) and it seems to have fixed it.
I cleaned around the oil cooler 500 miles ago, and while there is some new oil, it's still pretty clean. Nothing like before.
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Old 07-26-2013, 08:40 PM   #13
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How much does hard driving affect oil consumption? If autox guys can lose a quart a day, then I could see how driving around here the way I do could burn a lot of oil. I live so far back in the mountains, I actually have to drive across a submerged water bridge to get to my house haha.
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Old 07-26-2013, 09:22 PM   #14
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Compression test it.
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Old 07-26-2013, 09:46 PM   #15
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Quote:
Originally Posted by 2gnt2wrx View Post
Was it happening before you replaced the PCV?
Quote:
Originally Posted by trentsize View Post
Yes, it was burning oil then too.

it was already blowed up....and its still blowed up
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Old 07-26-2013, 10:46 PM   #16
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compression test it. As said above.

However, driving it hard can burn oil a lot more....those constant pulls up passes and having high boost and high load will push that oil out of every available opening. Oil is operating at upwards of 100psi under load! A small leak at idle can be a big leak when under those conditions.

I live in Colorado and go snowboarding twice a week, it put a lot of stress on my car and I flew threw oil before I fixed it.

A compression test is generally free if you go down to a local parts store and ask to borrow the equipment. It is a gauge you attach to a spark plug outlet, then crank over the engine without the ignition fuse in - very simple to do and tells valuable information.

All four cylinders with low compression readings could indicate that the rings are really wearing down for the pistons - letting a lot of oil blow by into the combustion chamber.

two adjacent cylinders could be information leading to a headgasket leak

One bad cylinder or a couple could be information about bad valves.

It just tells a lot of information regarding the health of the engine and could tell why it's burning so much oil....if you have great compression, and there is a lot of oil in the turbo - could be a turbo seal and you could save yourself thousands. (tends to go bad with high mileage vehicles) and visa-versa.
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Old 07-27-2013, 12:07 AM   #17
trentsize
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It should be normal to burn more at the end of the OCI than at first due to dilution right?
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Old 07-27-2013, 05:21 AM   #18
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i just GOTTA ask....

what oil...exactly are you putting in it???


oh...and its blowed up
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Old 07-27-2013, 08:07 AM   #19
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Quote:
Originally Posted by Uncle Scotty View Post
i just GOTTA ask....

what oil...exactly are you putting in it???

oh...and its blowed up
You didn't read the op, it states what oil.
I just have to ask, how old are you Scotty and what is your level of education ?
Any time I see a post from you it comes across as immature and disrespectful.
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Old 07-27-2013, 11:53 AM   #20
2gnt2wrx
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Quote:
Originally Posted by D-Rodman

You didn't read the op, it states what oil.
I just have to ask, how old are you Scotty and what is your level of education ?
Any time I see a post from you it comes across as immature and disrespectful.
He didn't say what he was using before he switched.
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Old 07-27-2013, 01:12 PM   #21
trentsize
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Last change I put in Castrol 5w30 high mileage. Before that I have no idea, I didn't own the car.
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Old 07-27-2013, 01:13 PM   #22
trentsize
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Quote:
Originally Posted by D-Rodman View Post
You didn't read the op, it states what oil. I just have to ask, how old are you Scotty and what is your level of education ? Any time I see a post from you it comes across as immature and disrespectful.
Thank you haha.
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Old 07-27-2013, 07:32 PM   #23
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Quote:
Originally Posted by D-Rodman View Post
You didn't read the op, it states what oil.
I just have to ask, how old are you Scotty and what is your level of education ?
Any time I see a post from you it comes across as immature and disrespectful.

blow me

and i was thinking of what oil was in it BEFORE the t6

and blow me

and the OP needs a new shortblock because its blowed up
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Old 07-27-2013, 07:46 PM   #24
trentsize
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Originally Posted by Uncle Scotty View Post
blow me and i was thinking of what oil was in it BEFORE the t6 and blow me and the OP needs a new shortblock because its blowed up
Go back to the drunk thread, you're more useful there.
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Old 07-27-2013, 09:07 PM   #25
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Quote:
Originally Posted by trentsize View Post
Go back to the drunk thread, you're more useful there.

go buy a new motor and stop with all this nonsense
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