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Originally Posted by tennisfreak
49 views not one post.
Come on everyone there has to be someone out there with some experience on this!!
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Don't need it on these later gen turbo BMWs. Starting with the N55 motor, BMW made revisions to vapor re-circulation system to keep oil mist/vapor in check and reduce build up on the intake valves. Even after 60K miles, N55s rarely have enough build up to necessitate cleaning. The N54 is prone to build up and requires routine maintenance.
During hard driving, these motors don't suffer from oil ingestion issues like some others like certain GM LSX motors.
Long story short, these motors don't need catch cans and if anything, they'll cause more harm than good with all the extra vacuum line and potential for vacuum leaks.
Expect to have to clean the intake valves every 5 or 6 years. It's just the nature of direct injection motors and there's no way of getting around it unless a secondary injection system (i.e., fuel, meth, water) is employed upstream of the valves.