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Old 10-13-2013, 10:40 AM   #1
guest082216
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m54 oil consumption possible solution

Hi BMW fanatics! i'm new here and this is my first post.
I live in UK but english is not my first language, so sorry for any problems with reading this.
My car, e46 325ci msport 70000 when bought it and now 110000 miles
I love it but since i bought it I've notice big thirst for oil
After reading many forums and post I've decided to change VCG and CCV(oil separator with hoses) But after few days driving no changes ,still 1/2 litre per 300 miles (castrol 5w30)
Next thing was to change for thicker oil 0w40,small improvment but not much.Bit confused because car is running fine,pulls fine no leaks ect,ect.
Many forums mentioned problems with valve seals so another DIY was in My plans
I've did valve and vanos seals with out removing the head and this time I was sure the problem is gone because consumption was near to zero,but after 6-8 months it came back .So i order another set of valve seals i notice that they are different to old ones (tighter on the stem),bell start to ring,BMW put wrong seals and now they improve them for beter seal,I thought this time must be OOOOKKKKKK!!!!!!
It took another few months when car start to drink again 1/2 litre per 600 mile,.Found some info saying if the valve guides are worn,replacing stem seals not gonna help for long.
After months of planning I've decided to remove the head and see myself is going on!!!When I removed intake manifold I spot oil on the bottom of the 4 ports ,valves was stoping oil from geting to chambers( thats way car was smoking a bit on startup)
I feelt I'm going closer and after removing the head and taking it apart I've messured valve play! New valve stem is 5.94mm and guide is 6.00mm so 0.06mm play ,almost no play,and my was 0.2-0.3mm on intake and 0.3-0.5 on exhaust.
Now head is in machininst shop and probably next week i'm puting it back
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Old 10-13-2013, 10:44 AM   #2
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some more pic. of carbon build up and block after degreasing
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Old 10-13-2013, 10:48 AM   #3
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picture of the valve in oil is not bmw (forgot to take pic) it's from different car but my was looking exactly the same.

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Old 10-13-2013, 10:06 PM   #4
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Good work mate! Nice first post!
I hope that'll fix it.
How did you get the pistons so nice and clean?
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Old 10-13-2013, 10:32 PM   #5
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Nice work, i am very jelly cuz id love to accomplish this in my car .

I wanna rebuild the engine my self but afraid to put it back together.
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Old 10-14-2013, 12:14 AM   #6
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The worst part of this project is removing exhaust manifold(lack of space) and not loosing any part:s like small nuts or clips.Best way is to keep them labled i small jars or cups so its easy to see what is to go next.When removing head,ask somebody for help because its very heavy.
As for cleaming block and pistons-,tooth brush,wd40, for pistons and aceton for block.and two beers:-)
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Old 10-14-2013, 08:28 AM   #7
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mine doesn't use any, and i beat the snot out of it
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Old 10-15-2013, 06:16 AM   #8
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Originally Posted by wasp9166 View Post
mine doesn't use any, and i beat the snot out of it
That's why it doesn't use any. These engines were NOT designed to be 'babied' yet many are.
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Old 10-15-2013, 06:29 AM   #9
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CCV system and air distribution manifold tend to be major sources of oil usage.

Also make sure oil return in lower dipstick tube is not blocked.

These are very common issues.

Read about dipstick tube in the 3rd link below in my signature.
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Old 10-15-2013, 06:33 AM   #10
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That's why it doesn't use any. These engines were NOT designed to be 'babied' yet many are.


Mine gets babied and doesn't use any.

Hope all that great work by the OP solves his issue.
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Old 10-15-2013, 07:01 AM   #11
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I've done all that , ccv hoses dipstick oil catch for few weeks and nothing .If new guides not gonna help ,I will have to live with this ,don't won't to spend more money .I've spent enough. Will keep U guys updated
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Old 10-15-2013, 08:35 AM   #12
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Looking forward to your conclusion. I have replaced all the usual suspects (CCV, VANOS seals, VCG, cleared dipstick tube) and my oil consumption remains the same.
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Old 10-15-2013, 08:48 AM   #13
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How much oil is it ?
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Old 10-15-2013, 08:57 AM   #14
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Forgot to write in my first post about knocking/rattling sound when car warming up and knocking/ pinging sound when accelerating hard, I'm 99% sure that was leaking exhaust valve cyl.no 4 with 0.5mm play
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Old 10-15-2013, 09:05 AM   #15
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My consumption is much lower than yours (1Q every 4,000 miles) but has increased in the last 40-50k miles.
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Old 10-15-2013, 09:14 AM   #16
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Re: m54 oil consumption possible solution

1Q it's almost nothing comparing to my car.If U changed all this things and consumption is increasing that might be the same case or oil rings.

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Old 10-15-2013, 09:36 AM   #17
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Quote:
Originally Posted by sprintman View Post
That's why it doesn't use any. These engines were NOT designed to be 'babied' yet many are.
true, just about any engine runs better the more you kill it imo

no nasty buildup

esp with these ccv systems

change it every 5k, use bmw 5w/30, pound on it
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Old 10-15-2013, 10:36 AM   #18
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Quote:
Originally Posted by mlody View Post
Forgot to write in my first post about knocking/rattling sound when car warming up and knocking/ pinging sound when accelerating hard, I'm 99% sure that was leaking exhaust valve cyl.no 4 with 0.5mm play
The valve can still seal with that much play. Are you replacing the valves too, or just regrinding them?
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"Would the codes indicate if it's the carburator?"
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Old 10-15-2013, 11:56 AM   #19
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This head was noisy and most when warm up like diesel.On cyl 4 exhaust was the loudest one and as I findout after removing head this one was leaking.Replacing guides and grinding old valves gonna help this engine run smoother and possibly reduce oil consumption
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Old 10-16-2013, 07:44 AM   #20
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I'm still waiting for the head.I manage to open oil separator(3 year old oem) without damaging it and inside I found......................................
NOTHING.No deposit ,no oil ,almost dry.
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