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Old 12-16-2012, 07:31 PM   #17
zuckuss00
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Join Date: Mar 2007
Location: SoCal
Posts: 912
My Ride: K24Z7
Quote:
Originally Posted by mikhit View Post
I have been in the same boat as you for a little over a year now with my 03 325. I started experiencing increasing oil consumption, followed the same procedure as you replacing the various gaskets, ccv, etc...all the usual suspects. All the while documenting the consumption and not seeing any improvement. I, too, noticed blacker than normal exhaust tips...

Stinger is correct, the compression test will likely not help identify the internal source of the consumption. I had a conversation with the shop foreman at my local dealership, with whom I have a very good rapport. First, he explained that a compression test would not likely be beneficial and just be a waste of the money. He also explained that the valve stem seals are an uncommon source of consumption on this engine. He was pretty confident that it is the rings, and went on the say that they are most likely sticking and not allowed to float properly.

Anyway, his suggestion was to use a can of BG MOA every ~3000mi as consumption persists at is current rate. He explained that the MOA was essentially just a little ATF with some other detergent additives and "could" help free up the sticking rings (he also cited personal success with the product). Well, I have been running MOA in my oil for about 3 months now and have seen improvement. My consumption went from 1 qt every ~600-700 miles, to my current rate at 1qt/~1100miles, and it continues to improve. I have been pleased with the results so far, albeit rather preliminary. If I can get to 1qt/1500-2000mi I will be very happy.

I've seen very little mention of MOA on these or any other BMW forums. BMW approves the use of the additive and it is sold at my local dealerships. Once I have full data, I plan to create a thread documenting my results.

In the meantime, might be worth a try...good luck!
Thanks for the suggestion.

I've heard of BG products before. I've never really looked into their MOA line. You mentioned the slight improvement in consumption and I must ask if your driving conditions have changed at all in that time frame? Things like high RPMs and traffic seem to cause a faster rate of consumption for obvious reasons.

I'm going to ask my mechanic about the MOA, I know he's an advocate of their 44k product. I'll see if he can get me a couple cans and I'll run it. You add one can every 3000 miles?

Also, had you have had a cylinder leak down test? This could possibly isolate the source of blow by to a specific piston or oval cylinder. I sort of want to have to test done so I can confirm its the pistons and eliminate valve steam seals as a potential cause.
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