Burning Oil only at higher revs?

Tricky [RCAF] · 08-31-2006, 12:36 PM

I have researched the issue, and have a few ideas, but if your car was burning oil, but only seemed to do it when you really stepped on it, what do you suspect would be some of the most obvious causes.

My car is a 5 speed 99RS, 58000 miles.
Brullen Headers, and Catback, and an Injen CAI.

I suspect it is most likely my valve seals, but i am curious to hear some other opinions... Thanks

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Tim Sanderson · 08-31-2006, 01:36 PM

What weight oil are you using? Have you checked your pcv valve?

BURTONRIDR · 08-31-2006, 04:22 PM

will a bad pcv valve cause a car to burn oil?

Tricky [RCAF] · 08-31-2006, 04:22 PM

I replaced my PCV Valve 2 days ago, i can't tell yet, if the problem is resolved. It seems better, but I suspect that may just be wishful thinking. I cleaned my tail-pipe the other day to see how long it would stay clean for, and so far so good. I am currently using 10w30, since I was wondering if it may last longer than the 5w30 that is recommended. Perhaps a switch to synthetic?

Tricky [RCAF] · 08-31-2006, 04:22 PM

The package on my PCV valve specifically stated that it should improve oil consumption.

MeanEditor · 09-01-2006, 01:08 PM

what makes you think you are burning oil? A big puff of black smoke at WOT? Are you noticing that you are consuming oil on your dipstick? Is there wet oil in your tailpipe or just lots of black carbon buildup?

If all you are seeing is lots of black smoke at WOT, then you are probably just seeing unburnt fuel as you go rich at the top end. This is ok and normal.

If you are getting alot of blue smoke then you might just have a loose motor that gets more blow-by at the top end, also ok, unless you are doing a spy-hunter in which case, that is not ok.

If you are noticing that you are consuming oil by checking the dipstick, at what intervals are you checking etc. Are we talking a quart every 3000 miles or every 100?

If you rail on your car and live near redline, you will use oil and that is fine it does not mean your motor is bad. If you are blinding traffic with your 007 smoke screen at WOT, you might have bad rings or headgaskets etc.

in short... <<<<MORE DETAILS>>>>

Tricky [RCAF] · 09-01-2006, 04:44 PM

Quote:

Originally Posted by MeanEditor

what makes you think you are burning oil? A big puff of black smoke at WOT? Are you noticing that you are consuming oil on your dipstick? Is there wet oil in your tailpipe or just lots of black carbon buildup?

My friends have told me that they have seen smoke when I really step on it. You don't really see it otherwise.

Quote:

Originally Posted by MeanEditor

If all you are seeing is lots of black smoke at WOT, then you are probably just seeing unburnt fuel as you go rich at the top end. This is ok and normal.

Quote:

If you are getting alot of blue smoke then you might just have a loose motor that gets more blow-by at the top end, also ok, unless you are doing a spy-hunter in which case, that is not ok.

This is definately a possibilty, but I still think I go through a significant amount of oil.

Quote:

If you are noticing that you are consuming oil by checking the dipstick, at what intervals are you checking etc. Are we talking a quart every 3000 miles or every 100?

I did an oil change drove about 500 miles, then I did a 20 hour road trip. So roughly 3 quarts I am guessing is burnt off in less than 3000 miles.

Quote:

Originally Posted by MeanEditor

If you rail on your car and live near redline, you will use oil and that is fine it does not mean your motor is bad. If you are blinding traffic with your 007 smoke screen at WOT, you might have bad rings or headgaskets etc.

It isn't a smoke screen at all, but still seems to go through a ****load of oil. I am wondering if it could be o-rings??? The car only has 58000 miles, so that is not that many.

Tricky [RCAF] · 09-04-2006, 03:42 PM

I drove to the lake this weekend, an hour each way. I get back, my tail-pipe is black, and my oil is no longer at the top. So the PCV valve was not the culprit...What is the next logical thing, my valve seals?

SOLUTION · 09-04-2006, 04:28 PM

Valve seals or piston rings are a possibility.

08-31-2006, 12:36 PM	#1
Tricky [RCAF] Scooby Newbie Member#: 50183 Join Date: Dec 2003 Chapter/Region: W. Canada Location: Edmonton, Alberta Vehicle: 1999 2.5RS x2 RBP & BDP	Burning Oil only at higher revs? I have researched the issue, and have a few ideas, but if your car was burning oil, but only seemed to do it when you really stepped on it, what do you suspect would be some of the most obvious causes. My car is a 5 speed 99RS, 58000 miles. Brullen Headers, and Catback, and an Injen CAI. I suspect it is most likely my valve seals, but i am curious to hear some other opinions... Thanks * Registered users of the site do not see these ads.

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08-31-2006, 01:36 PM	#2
Tim Sanderson Scooby Guru Member#: 6486 Join Date: May 2001 Chapter/Region: MWSOC Location: S.E. wisconsin Vehicle: 00 Impreza 2.5 RS Blue Ridge Pearl	What weight oil are you using? Have you checked your pcv valve?

08-31-2006, 04:22 PM	#3
BURTONRIDR Scooby Newbie Member#: 72132 Join Date: Oct 2004 Chapter/Region: NWIC Location: Spokane, WA Vehicle: 2000 Legacy GT White	will a bad pcv valve cause a car to burn oil?

09-01-2006, 01:08 PM	#6
MeanEditor Scooby Specialist Member#: 123139 Join Date: Aug 2006 Chapter/Region: NWIC Location: Oregon Vehicle: 1993 Turbo L Wagon RED	what makes you think you are burning oil? A big puff of black smoke at WOT? Are you noticing that you are consuming oil on your dipstick? Is there wet oil in your tailpipe or just lots of black carbon buildup? If all you are seeing is lots of black smoke at WOT, then you are probably just seeing unburnt fuel as you go rich at the top end. This is ok and normal. If you are getting alot of blue smoke then you might just have a loose motor that gets more blow-by at the top end, also ok, unless you are doing a spy-hunter in which case, that is not ok. If you are noticing that you are consuming oil by checking the dipstick, at what intervals are you checking etc. Are we talking a quart every 3000 miles or every 100? If you rail on your car and live near redline, you will use oil and that is fine it does not mean your motor is bad. If you are blinding traffic with your 007 smoke screen at WOT, you might have bad rings or headgaskets etc. in short... <<<<MORE DETAILS>>>>

09-04-2006, 03:42 PM	#8
Tricky [RCAF] Scooby Newbie Member#: 50183 Join Date: Dec 2003 Chapter/Region: W. Canada Location: Edmonton, Alberta Vehicle: 1999 2.5RS x2 RBP & BDP	I drove to the lake this weekend, an hour each way. I get back, my tail-pipe is black, and my oil is no longer at the top. So the PCV valve was not the culprit...What is the next logical thing, my valve seals?

09-04-2006, 04:28 PM	#9
SOLUTION Scooby Specialist Member#: 43602 Join Date: Sep 2003 Chapter/Region: NESIC Vehicle: 2005 Outback Sport	Valve seals or piston rings are a possibility.