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Old 11-23-2011, 11:07 AM
96 GGM 528I 96 GGM 528I is offline
Officially Welcomed to the 'Fest
Location: Cleveland OH
Join Date: Nov 2010
Posts: 241
Mein Auto: 1997 528I Daily
Mine looked exactly the same when I pulled the head for a HG job. I suspected a coolant to cylinder 6 passage way leaking very small. The car never really overheated but would warm up with sprinted driving. I used roll-loc disc and sea foam, I then followed that with carb cleaner to get in the piston skirts with compressed air to blow it out. The compressed air helps a lot. Also after you will want to change your oil to get out any cleaner that seeped past the piston. 10k later and my car is great.
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