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Old 07-18-2017, 02:05 PM   #1
coupe_bmw
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Engine oil disappears-not that easy

Hi,

I'll try to keep it short. I bought a 325Ci, then replaced the engine after half a year to a 30i, 130000 miles on the clock. Not immediately, but it started smoking heavily when I staerted the engine, then only little smoke. Later it was smoking whenever she wanted, eating even 1 liter of oil ( thats under the minimum on the dipstick). Then I replaced the carter gas filter. After that, there was no smoke and the oil level remained maximum. After about 200 miles almost 1 liter disappeared , and I say disappered, because I checked the oil level before almost every start. Then I replaced the oil filter housing gasket, a 100 miles later 0,5 liter disappeared. I can't see oil under tha car (there is no plastic plate under the engine). The carter gas filter replacement solved the smoking issue (at least I can't see it at starts, or in the mirror as before) please help I want to enjoy my car like before
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Old 07-18-2017, 09:03 PM   #2
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Have you checked the ccv? Maybe it's clogged up and spitting oil into the intake?
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Old 07-19-2017, 03:41 AM   #3
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I think ccv is the carter gas filter, that I have replaced, that solved the smoking issue
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Old 07-19-2017, 09:36 AM   #4
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Quote:
Originally Posted by coupe_bmw View Post
I think ccv is the carter gas filter, that I have replaced, that solved the smoking issue
The CCV has nothing to do with a gas filter in any way and never heard of the CCV referred to as a carter gas filter. The CCV is tucked up with the engine. This is a link to a blog and videos for replacing the CCV:

https://blog.bavauto.com/8003/diy-vi...lation-system/

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Old 07-19-2017, 09:49 AM   #5
coupe_bmw
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Thanks, this is what I have replaced... Any other idea?
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Old 07-19-2017, 09:58 AM   #6
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If the rings are shot then you are just going to burn oil. As a stopgap, I have had success with switching to Rotella T6 oil and doing the O2Pilot mod. Cut my oil consumption significantly
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Old 07-19-2017, 10:32 AM   #7
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Thanks, but what is a O2 pilot mod?
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Old 07-19-2017, 10:39 AM   #8
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Thanks, but what is a O2 pilot mod?
In short, connect a vacuum line from the nipple on the top of the CCV to a vacuum port on the back of the engine.

This will increase vacuum and (hopefully) stop oil from slipping past your piston rings.

I did this on my 2002 coupe a short while ago. Like you, I had white smoke on startup, at traffic lights, after idle, etc. The 02 mod helped me significantly. I no longer have plumes of smoke, and my oil consumption has really dropped.

lingon300k has a great how-to right here: https://forum.e46fanatics.com/showthread.php?t=1115223
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Old 07-20-2017, 09:29 AM   #9
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Other places for leaking is the oil pan gasket and the valve cover since you replaced the OFHG already. Without a bottom tray I would run the car and get it nice and warm/full temp and park the car overnight over a large piece of cardboard. Check the cardboard for oil drips the next morning.

Other than that - the rings is the other major source of oil use as already noted. Mine uses oil - .5 qt per 500 miles or so but yours seems to be more than that I think. I can only see oil in the exhaust when I hit the gads hard - basically wide open throttle. If you are using more than a qt per 1,000 miles - I would be concerned about the health of the used engine....
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Old 07-20-2017, 11:27 AM   #10
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When you replaced the CCV did you clean the dipstick holder really well? It can get clogged and blocks the ccv from working, even if you've replaced it. There's a superceded part number for it, but many just clean it really well.

...and of course, check your coolant for oil and vice versa in case the motor you put in had had a head gasket issue which has resurfaced. Hope not!
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