One of the other causes of high oil consumption is a blocked CCV drain hose or the dipstick tube that it drains through. The oil from the CCV can't get back into the oil sump/pan, builds up and gets sucked back into the inlet manifold. There are 2 models of dipstick tube, with the later one designed to fix the problem.
Burning a lot of oil
I know M54s burn oil but very recently I am burning a lot.
I have had "minimal" oil consumption; probably a quart every 3500 miles but I topped off a month ago, and it has burned at least a quart and a half. I am unsure of the mileage, but I know it has been under 1k miles.
I have not changed my driving style. I did a 1,300-mile round trip in July. I believe I burned a little oil on that trip when I checked, but not enough to even need to top off.
The engine has 117k. I have not done the 02 pilot mod or any engine flushes yet.
Any idea why all of the sudden it starts burning a lot of oil?
I have been reading other threads about oil consumption and besides carbon build-up, I am not sure why it would start burning excessive amounts of oil. And no, I don't baby the car, it sees high RPMs often enough to "hopefully" not get carbon build-up.
I have had "minimal" oil consumption; probably a quart every 3500 miles but I topped off a month ago, and it has burned at least a quart and a half. I am unsure of the mileage, but I know it has been under 1k miles.
I have not changed my driving style. I did a 1,300-mile round trip in July. I believe I burned a little oil on that trip when I checked, but not enough to even need to top off.
The engine has 117k. I have not done the 02 pilot mod or any engine flushes yet.
Any idea why all of the sudden it starts burning a lot of oil?
I have been reading other threads about oil consumption and besides carbon build-up, I am not sure why it would start burning excessive amounts of oil. And no, I don't baby the car, it sees high RPMs often enough to "hopefully" not get carbon build-up.
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Is there a way to know if it is clogged?
Remove the tube from the dipstick (sometimes easier said than done). Blow into each direction.Is there a way to know if it is clogged?
- Should be clear towards the CCV
- Should be able to hear air bubbling through the oil in the sump/pan
That sucks. Hopefully it's just a clogged ccv.
The e53 X5 I had burned a ton until I changed out the valve cover. The m56 mod made a huge difference.
The e53 X5 I had burned a ton until I changed out the valve cover. The m56 mod made a huge difference.
Sudden increase?
Change your CCV now. With the BMW version-
the cold weather one is surprisingly affordable.
t
Change your CCV now. With the BMW version-
the cold weather one is surprisingly affordable.
t
If you're not in too cold a climate, catch can and engine flush with Liquimoly. Replace the dipstick tube CCV drain with a filtered breather to even out the crankcase vacuum.
I did the open the oil cap while running the test and there was a slight suction. Like almost nothing. The revs increased just a little after I pulled the cap off. I also have no mayo on the oil cap or any sludge at all.
Right now, I feel the piston rings have carbon on them more than a CCV failure.
Right now, I feel the piston rings have carbon on them more than a CCV failure.
A quart every 3500 miles? Sounds fine to me. What grade oil?
A quart every 3500 miles? Sounds fine to me. What grade oil?
I am running Castrol 5w-40but I topped off a month ago, and it has burned at least a quart and a half. I am unsure of the mileage, but I know it has been under 1k miles.
If the increased consumption was sudden, I'd be looking at CCV system, pronto.
So... I don't know what has happened but it seems I haven't been burning much oil now. I haven't been driving it a lot but I haven't seen the dip stick lose any oil.
The only thing that I did to "maybe" fix this issue, I removed the CCV drain line and put it back on. That's it.
Also my oil sensor is going bad as well.
The only thing that I did to "maybe" fix this issue, I removed the CCV drain line and put it back on. That's it.
Also my oil sensor is going bad as well.
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