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10-30-2019, 11:48 AM | #1 |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
Burning Excessive Oil
Hello all.
2015 STi, built motor, no head work New FP Black JB turbo installed couple months back w/EWG and 1300cc I use Rotella T6. I had to add 2 quarts yesterday after adding nearly a quart about 2 weeks ago. No visible leaks. Bad oil smell in cabin. No smoke of any sort at the moment. Should I be worried???
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10-30-2019, 12:33 PM | #2 |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
Depending on what kind of driving you've been doing over the last 2 weeks, yes. That is a lot of oil. Has it always been consuming this much oil?
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10-30-2019, 12:43 PM | #3 |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
The consumption seems to have increased over the past 6 months. I have been adding a quart every 2 weeks or less for some time now.
I drive 10-12 min to work, all highway, no stop and go. I might get on it for a quick 2nd thru 3rd gear pull once a day at lunch. Motor was built about 2 years ago to the day - about 20k miles Thanks KB |
10-30-2019, 01:28 PM | #4 |
Scooby Specialist
Member#: 435142
Join Date: Nov 2015
Chapter/Region:
MWSOC
Location: Commerce Twp, MI
Vehicle:2004 STi Java Black Pearl |
Who built the engine? AOS/catch can setup?
Turbo oil drain could be leaking, I suppose. If its just the oil smell and no smoke out of the exhaust, that'd have to be a pretty big leak somewhere... cam seals? Do you have an oil pressure gauge? |
10-30-2019, 01:42 PM | #5 |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
IAG Competition AOS
Defi oil pressure gauge. Always indicates things are fine there. I don't know. I can't help thinking it is piston related or oil getting passed through the exhaust. |
10-30-2019, 04:56 PM | #6 |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
So the easy way to check the engine health is compression and leak-down. This will give you a decent probability of detecting something internally wrong like a ring-land failure. After that, you start playing detective; remove the downpipe, look in the turbo inlet, replace PCV Valve, look under the engine, etc... until you find the source. With that much of a loss, and knowing it hasn't always been like that, something has happened to cause the consumption and it's a lot.
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10-30-2019, 05:20 PM | #7 |
Scooby Newbie
Member#: 484342
Join Date: Apr 2018
Location: OKC
Vehicle:2016 WRX Ice Silver Metallic |
Just started having what sounds to be the exact same issue: excessive oil burn, not much smoke (unless I open the hood after my commute there is definitely a little bit of something something with a big smell). This is with my 2016 WRX with 57,000 miles on it. It's pretty built out, KB Twin Scroll Fury kit with a GTX-3067R, iAG built shortblock, KillerB AOS, etc.
Burned 1.5 quarts over a 400 mile trip to Texas and back (to OK). Typically burns about a quart every 800-1000 miles. I ordered a replacement "Subaru Complete-Control Valve" (PCV Valve) that I will be replacing, see if that does it. Also after my commute today I'll take a look at the turbo inlet and see if we have some oil there. I'll let you know what I find (famous last words), if I can't fix it I'll be going to my local pro's for a checkup. |
10-30-2019, 05:46 PM | #8 |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
I am anxious to know how you make out. I will end up taking it to the builder. I am just a bit scared to know what the problem is.
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10-30-2019, 06:41 PM | #9 |
Scooby Specialist
Member#: 435142
Join Date: Nov 2015
Chapter/Region:
MWSOC
Location: Commerce Twp, MI
Vehicle:2004 STi Java Black Pearl |
KillerB is right (as usual). That's what I'd be doing provided you don't see any leaks underneath or anything else glaring.
Another thought: do you drive short trips at times and live in a colder climate? If so, drain hoses on AOS can "gunk" up and create a clog, which would mean things aren't breathing the way they should, and oil could be getting blown out your vent hose. Although, that would be a lot of oil to be losing in this manner, imo. |
10-31-2019, 08:38 AM | #10 | |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
Quote:
If you use our unit, it's super easy to inspect and clean. Heck you can even clean out the lines without even removing the unit too :P |
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10-31-2019, 12:17 PM | #11 |
Scooby Specialist
Member#: 491095
Join Date: Sep 2018
Chapter/Region:
SWIC
Location: New Mexico
Vehicle:2009 STi Blue Blue |
I found my PCV to block hose had ripped nearly completely off causing similar smell, don't remember consumption, but would recommend check for wet areas/leaks and if none, run seafoam through brake booster hose to help reduce potential of carbon causing rings/valves to stick!
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10-31-2019, 01:26 PM | #12 | |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
Quote:
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11-04-2019, 07:00 PM | #13 |
Scooby Newbie
Member#: 508020
Join Date: Nov 2019
Chapter/Region:
NESIC
Location: Somerville MA
Vehicle:2005 Legacy GT OBP |
My 2005 EJ255 with 118k burns a quart every 5000mi or so. Normal?
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11-04-2019, 07:20 PM | #14 |
Scooby Specialist
Member#: 273868
Join Date: Feb 2011
Chapter/Region:
MAIC
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normal and common are different
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11-05-2019, 03:26 PM | #15 |
Scooby Newbie
Member#: 473969
Join Date: Sep 2017
Location: Pittsburgh, PA
Vehicle:2006 WRX World Rally Blue |
My 06 EJ255 burnt 0 qt every 3000 miles. Literally the level never changed.
The OEM radiator cracked, slowly lost coolant till it overheated pretty bad and now consumes 1 qt every 1000 miles. Leak down points to worn rings. This was around 140k miles. |
11-05-2019, 05:05 PM | #16 |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
I have noticed the smell in cabin after spirited driving is really bad. Sometimes there is no smell until I have a little fun.
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11-05-2019, 07:38 PM | #17 |
Scooby Specialist
Member#: 435142
Join Date: Nov 2015
Chapter/Region:
MWSOC
Location: Commerce Twp, MI
Vehicle:2004 STi Java Black Pearl |
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11-06-2019, 09:42 AM | #18 |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
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11-07-2019, 11:12 PM | #19 | |
Scooby Specialist
Member#: 435142
Join Date: Nov 2015
Chapter/Region:
MWSOC
Location: Commerce Twp, MI
Vehicle:2004 STi Java Black Pearl |
Quote:
What happens when you boost/drive hard? You increase your crankcase pressure and test the abilities of your breather system, AOS, etc. If you smell oil, maybe its because oh idk, you're burning it, OR your AOS lines, specifically the drain as I mentioned already, (but "I assume you didn't read the previous posts") can get gummed up especially in colder climates preventing the oil from draining, backing up the AOS, and causing the exact scenario you're describing. Good luck... |
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11-08-2019, 07:33 AM | #20 |
Scooby Specialist
Member#: 459692
Join Date: Dec 2016
Chapter/Region:
South East
Location: Hampton Roads Va
Vehicle:2019 WRX STI silica black |
Doesn't the IAG competition vent to the atmosphere?
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11-08-2019, 04:11 PM | #21 | |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
Quote:
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11-10-2019, 10:31 AM | #22 |
Scooby Newbie
Member#: 468430
Join Date: May 2017
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There is another option. Contact Terry Dyson of Dyson Oil Analysis, he just retired from commercial consulting work but will continue to offer his services to the consumer market. There's no one better at forensic chemistry analysis and he'll tell you what's going on internally. At the minimum point you in the right direction. His Advanced Analysis comes with 15-20m audio going over the report including IR JOAP method and unlimited email correspondence, which is worth 10x what he charges for one advanced report. Blackstone is a meal at McDonalds', Dyson is Peter Luger's Steakhouse.
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12-24-2020, 06:06 PM | #23 |
Scooby Newbie
Member#: 473969
Join Date: Sep 2017
Location: Pittsburgh, PA
Vehicle:2006 WRX World Rally Blue |
After being under the car for a long time (changing the clutch) I noticed a lot of oil dripping from the heads onto the exhaust, causing the oil burning smell in the cabin.
Seems the head COVER gasket (NOT head gasket) is leaking and I'm not surprised at 190K miles. I'm losing about 1 qt every 1000 miles. |
12-25-2020, 01:03 PM | #24 |
Scooby Guru
Member#: 108051
Join Date: Feb 2006
Chapter/Region:
AKIC
Location: Oneonta, NY
Vehicle:2005 WRX STi WRB |
Ekk burning that much oil I'd pull the exhaust manifold and down pipe. If the engine is burning it the manifold will be soaked.
If the turbo is burning it the downpipe will be soaked... It's really that simple. Journal bearing turbos do not have a 360° shaft seal. So they will leak some oil regardless.. and heavily if the crankcase vent isn't setup well. |
12-26-2020, 08:39 AM | #25 |
Scooby Specialist
Member#: 515308
Join Date: Jun 2020
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How do they not have a 360 shaft seal? They use 2 piston type rings on both ends. A lot don’t have 360 thrust, but many of the customs do, fp ect
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