[abeardo83]

Is there any oil additive you can... Add, which will help do any de-gunking of the engine (if there is any).
Managed to finally find out that the car has on,y ever had its BMW scheduled oil changes, so wouldn't mind giving it a clean out - just in case.

Oil will be changed every 6k now that I own it!

[Soul_Glo]

Anyone here can tell you that the best method is regular oil changes. For example, when I brought mine it was gunked up pretty bad as the oil had only been changed according to the CBS. At 43k miles it had only had two oil changes! You would think that oil lasts 15k miles but some of ours are sensitive and the breather can clog up without a more regular oil change. So I changed mine every 3k for 9k miles and it did the trick. Since then I change it every 6k.

Otherwise you could try Kreen:

http://www.kanolabs.com/engCle.html

Accurate and unbiased review:

http://www.bobistheoilguy.com/forums...Number=1940735

Having failed this approach or if you are really concerned then nothing beats a good old fashioned manual clean.

Best wishes

BG