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What brand of flush are you using? Apparently from some reports, they can be very harsh solvents and should only be run/idled for only a few minutes then change oil and filter. I would ask around at BMW dealers and independent shops regarding their recomendations
Here in the US there is a product call Auto-RX (do a google search) that is a metal cleaner intended to gently clean your engine. Basically it is a 3,500 mile two step cleaning/rinse product. Change oil (any oil) and filter, put in Auto-RX and drive about 1,500 miles. then change oil and filter (no synthetic this time) and drive 2,000 more miles to "rinse" the remaining contaminants out. Then change oil (oil of your choice) and filter and you are done. However, do this process twice if you have over 100,000 miles. Some people claim it is "snake oil" others say it works very well.
I am currently 500 miles in the first phase. No problems car seems to run great.
Good luck
Last edited by Russell; 09-28-2005 at 11:18 AM.
Thanks,
1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment