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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-04-2020, 07:46 AM   #1
thecos
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Buring Massive Amounts of Oil - Valve Seals or Catch Can?

Quick back story : I'm chasing oil consumption for a couple of years, 325i, 140k miles now, it's been getting progressively worse. Changed CCV 3-4 years ago with all dealer parts, recently noticed that return tube to dipstick was DRY. No oil thru it for years? I was also getting blue smoke on start up.

My most recent attempt was to install the M56 valve cover, since my original cracked and it would replace the M54 CCV. I did the M56 install, with a new cap and new membrane, but leaving the old CCV in place as well since I didn't have time to remove it then, so it's in series with the M56 CCV.

NOW: I'm still getting blue smoke pretty much on every start up. I tried Rislone (sp?) engine treatment for gunked up rings but I didn't notice any change. I'm adding a quart pretty much every 1-2 fill ups (300-600 miles).

Misc: I just did the cooling system for the second time, all gaskets were changed as needed, OFHG, Oil Pan Gasket, since I replaced the cracked VC there are no visible leaks.

What else should I try before I rebuild another engine and swap it in? I love the car and want to keep it running but I'm bleeding money toward this problem. Probably close to gunking up my cats. I'm out of ideas.
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Old 04-04-2020, 12:38 PM   #2
Barracuz
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Try a piston soak. People have had good results with a piston soak for 24hrs. Then use a wetvac or turkey baster to extract fluids. And start it up.
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Old 04-04-2020, 01:01 PM   #3
thecos
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Originally Posted by Barracuz View Post
Try a piston soak. People have had good results with a piston soak for 24hrs. Then use a wetvac or turkey baster to extract fluids. And start it up.
So you're saying it's most likely gunked up rings causing smoke on start and consumption?

What am I soaking with? Thanks
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Old 04-04-2020, 02:23 PM   #4
Barracuz
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There are two cuases of oil consumption on our engines.

If the ccv clogs up or freezes, common in colder climates, it creates alot of vacuum in the cranckcase. Oil is then sucked up from the dipstick and into the intake manifold where it's then burned in the combustion chamber. Too much oil will cuase spark plugs to foul causing misfires, alot of carbon buildup in the combustion chamber where it then gets blown into the ring area, etc.

M54 uses a low tension oil ring setup that's sensitive to cranckcase pressure. When the ccv fails crankcase pressure increases and forces oil up into the rings that eventually Cokes and builds up along the rings. As this gunk builds up more oil is allowed to leak thru and you're basically burning oil.

Basically if the ccv fails you'll burn oil. Since you already changed the ccv I would suspect rings.
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Old 04-04-2020, 02:58 PM   #5
jarheadp3
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Have you looked into the '02Pilot mod'? As far as im aware its basically a simple way to increase engine vacuum on idle and a lot of people have managed to slow there oil consumption down with it, the theory is that the increased vacuum pulls the piston rings out reducing the oil getting through.

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Last edited by jarheadp3; 04-04-2020 at 02:59 PM.
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Old 04-04-2020, 04:35 PM   #6
thecos
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Originally Posted by jarheadp3 View Post
Have you looked into the '02Pilot mod'? As far as im aware its basically a simple way to increase engine vacuum on idle and a lot of people have managed to slow there oil consumption down with it, the theory is that the increased vacuum pulls the piston rings out reducing the oil getting through.

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Yes I did the 02 pilot mod before the m56 vc. It's still on actually because I never removed the original ccv.
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Old 04-06-2020, 10:26 AM   #7
jarheadp3
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Originally Posted by thecos View Post
Yes I did the 02 pilot mod before the m56 vc. It's still on actually because I never removed the original ccv.
To hazard a guess with the amount of oil its burning i would say it will probably be your piston rings, could be the valve stem seals but I'd lean more towards the rings with it being a known issue.

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Old 04-06-2020, 11:28 AM   #8
Renboy
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Generally speaking if there's a lot of blue smoke on start-up after the car has had a chance to sit, then it's the valve stem seals. Have you done a compression test?

Last edited by Renboy; 04-06-2020 at 11:28 AM.
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Old 04-06-2020, 01:20 PM   #9
thecos
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Generally speaking if there's a lot of blue smoke on start-up after the car has had a chance to sit, then it's the valve stem seals. Have you done a compression test?
No I haven't don't a compression test.
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