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  #1  
Old 02-19-2019, 09:13 AM
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Where's my oil going?

2006 3.0 and I can't seem to keep oil in the thing. I'm guessing we're looking at a loss of 1 qt every 300-400 miles. It doesn't smoke and there are no huge puddles in my parking spot. This time around the low oil indicator did not give me a message, so I'm assuming that sensor is bad. Not a big deal there, but I'm not sure where to look.

No smoke, runs fantastic, no puddles. Is this an oil separator issue?
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  #2  
Old 02-19-2019, 09:29 AM
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Welcome to the M54. It's a design issue with seals inside the engine. You are having the same issue I put up with in a 330i we owned. There are a few things you can do to help reduce consumption but it will not go away. 1) CCV System or 2) M56 valve cover with integrated CCV 3) Catch Can. Others will chime in who are more knowledgeable on the subject. In my case we changed the CCV system which made it more like 1 QT/800 miles but then sold it a few months afterwards as I was tired of the inconvenience.
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Old 02-19-2019, 09:38 AM
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Search for my posts in that infamous thread "BavarianE39 CCV Mod" using Duralast PCV valve.

You will be glad you do the CCV Mod.
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Old 02-19-2019, 09:55 AM
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Thanks guys, from reading on here, I kept seeing the CCV reference, but unfortunately CCV is too short a term to search for so I was having a hard time finding any information about it. What's the CCV stand for? Maybe that will help me with the search feature.

I'll also search for that mod. Thanks for the input. I'll report back once I can get something figured out and working towards a solution.
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Old 02-19-2019, 10:00 AM
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CCV in regards to engines refers to "crankcase ventilation" or "continuous crankcase ventilation".
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Old 02-19-2019, 03:06 PM
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Use external search engine such ad Google, you will see it.
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Old 02-19-2019, 05:01 PM
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Thanks, I'll try the google thing, plus I found the right posts mentioned up above so I should be good. I knew it was something to do with Crankcase Ventilation but couldn't figure out the first C Thanks for that.

I'm debating between doing the mod and just putting a new Oil Separator on it. Will putting the new oil separator on it resolve most of the issue or do I really need the mod to resolve it to a higher degree?
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Old 02-20-2019, 01:19 AM
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Quote:
Originally Posted by Siggy View Post
Thanks, I'll try the google thing, plus I found the right posts mentioned up above so I should be good. I knew it was something to do with Crankcase Ventilation but couldn't figure out the first C Thanks for that.

I'm debating between doing the mod and just putting a new Oil Separator on it. Will putting the new oil separator on it resolve most of the issue or do I really need the mod to resolve it to a higher degree?
You don't need the mod. If your CCV is functioning correctly you shouldn't see more that a quart per thousand miles which is not unusual for the M54. My experience. Others claim much better. The mod looks like "redneck" plumbing to me. But, that's just me.
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Old 02-20-2019, 10:49 AM
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- I did the stock CCV using BMW parts, cost was about US $150.
What a waste of money, oil consumption was still 1 qt/300 miles.
I wrote the CCV detail below.
Looking back, I should have done the CCV Mod from the get-go!

https://xoutpost.com/bmw-sav-forums/...-overhaul.html

In fact, when I bought another BMW (2004 X3 2.5i), I went straight to the CCV Mod, no regret!



- My CCV Mod is in thread # 164:

https://xoutpost.com/bmw-sav-forums/...oblems-23.html


So, don't waste the money on stock CCV parts, save the money for beer!
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Old 02-20-2019, 11:26 AM
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The 3.0 engine needs regular maintenance especially in the valve cover gasket area, the oil separator (CCV) clean, replace all the hoses and clamps or as some recommend replace the system with an alternative, oil filter housing gasket leak, and the vanos seal right above the Oil Filter Housing. All can leak away and you may not see a drop on the ground until the flood, as there is a steel/aluminum plate under the engine that catches a lot of what drips.

Clean your engine (Dawn Dish detergent will do) and you will see for yourself where all the oil is going. I would recommend doing a cyl leak down test to determine the health of the engine (rings, valves, pistons, etc) or a simple compression test if the first test is way to complicated for your DIY skills. These tests will help you confirm that the oil consumption issues are NOT piston rings and cyl wear issues. At this time/mileage it is time to do all the deferred maintenance that allowed you to buy the X5 cheap.

That last part is a guess on my part as you did not mention mileage or time of ownership. If I am wrong, I apologize in advance.
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Last edited by StephenVA; 02-20-2019 at 11:52 AM.
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