So I've been putting this off long enough. My car has been losing a lot of oil and it is finally time to correct the problem.
I have attached some pictures to show you some of the leaks. From my research it appears that I should be replacing the Valve Cover Gasket and likely the CCV as well. I was thinking that it wouldn't hurt to do the Vanos while its already exposed. My car has 97k miles on it.
Is there anything else that I should be replacing like hoses for the oil system? Part numbers for everything I need would be incredibly useful.
Oil filter housing gasket CCV and Valve cover. Also, inspect vanos oil lines as they can become drippy. My project this month is the CCV, dude to occasional misfires and a mysterious use of oil ( 1 qaurt every 500 miles) with no smoke coming out muffler.
Phoopsta I had already replaced the Oil Filter Housing Gasket at 69k miles. But I will definitely check those hoses that you mentioned. Do yo have part numbers?
Sprintman I am using the official iNNEr synthetic oil.
My valve cover problem could only be seen from the inside of the valve cover. It is a hairline crack that gets bigger as the plastic expands with heat. Then leaks oil
I replaced mine...it still leaked so I took it back off and that's when I found it. Really had to look hard to spot it
Plus........something else I want to point out that I've not seen anyone mention.
This valve cover when new has straight gasket mounting surfaces.
As it gets older.......where the bolts go.....it dips down and has a warped look to it. This could be a sealing problem a cheaper gasket can't solve that an oem gasket can. Check it with a straight edge.
I taped mine up on the inside. Then took a 12" block sander with some 400-600 grit paper and filed it back down straight and flat.......... I taped it so sanding dust wouldn't get in there,
Check the Exhaust Camshaft Sensor connection, it's directly over the oil spot on the radiator hose. I replaced the sensor the first few months of ownership and I did not replace the fastener which is highly recommended. As others had said, VCG or cracked VC. BTW, the OFHG is on the other side of the engine but it likely needs replaced.
I'm finally getting around to doing this and I have my car opened up right now.
I can only replace the VCG at moment and will be doing the vanos at a later date. I wanted to know if I would have to replace the valve cover gasket again, when I eventually work on the vanos. I don't foresee it being much further in the future... Maybe 5 to 8k miles from now (maximum)
You can usually reuse a recent VCG. But be prepared. Maybe have one sourced beforehand at a local auto parts store or BMW dealer just in case?
Also consider replacing, or keep an eye on, any hoses or rubber components that have been soaked with oil from that leak. Oil eats rubber over time when given heat as an appetite inducer.
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