M54 3.0i Engine Flush

[270_BMW]

What are your thoughts on an engine flush for a 250,000+ mile engine that has never been overhauled? I am considering it... but don’t want to tear up my internal seals... if you are for the idea, which engine seals would you recommend to replace? Thinking about pulling the engine and giving it a once over... but not really sure where to start.

[white_335i]

Are you planning on a full rebuild? If not, just change the seals that are leaking with engine still in the car. Typical leaking points are Valve cover, OFHG, Oil pan gasket, RMS.

As for the flush, is there sludge built up inside the engine? I did a engine flush in my 330i, but don't think it made any difference. I used the liqui moly flush..

[white46]

Do you have any issues with current motor?

[270_BMW]

Sort of... it’s running a bit rough. Not missing. But you can tell it has something going on. Labored and delayed throttle. Light tapping / knock.