DIY Solution to M54-M52TU CCV problems

[Scott ZHP]

Originally Posted by bcredliner

The majority of those that do some type of modification or workaround have a CCV system that is malfunctioning, in need of repair. IMO, if there is excessive oil consumption with a properly operating CCV system something else is the core cause.

Based on the mileage most of us have on our X5s it is quite likely we have or will experience CCV issues. I think the best fix is to clean or replace the CCV components rather than modify the system. If there was no excessive oil consumption for say the first 50,000+ miles I don't see the logic that the system is the problem and should be modified.

Oil consumption due to a faulty CCV system is often corrected by replacing the oil separator flap. In extremely cold areas there is a cold weather modification from BMW to address the freezing potential.

I share this opinion.

I replace the CCV and all hoses and clean out the air distribution manifold about every 60k miles. Use the cold weather version of the CCV, the insulated hoses and if you live in a really cold area - retrofit the cold weather dipstick - it eliminates the baffle that gets clogged. At the same interval, I use a can of BG Products "EPR" (aka BG109) to keep the rings unstuck. I have 148k miles on my 3.0i/M54, bought it new, and it uses virtually no oil.