1992 745 257K

Car purchased in 2014 with 170K. It was well maintained and has been since. Currently at 257K.

One year and 10K ago I replaced the head gasket because the cooling system was pressurizing and pushing coolant past seal points (hose connections and radiator cap).

The head was milled .008”. I used a Elring gasket set. The block was extremely clean. I cleaned the bolt holes. I cleaned and oiled the bolts. I torqued the bolts in the correct steps and order before the final +90 degrees. This wasn’t my first rodeo and everything appeared to be routine.

This is my son’s car and not always under my watchful eye. Today we were doing a trans flush in an effort to solve a random overdrive up shift. While doing that I noticed the tell tale white residue of G-05 at various pressure points of the cooling system as well as coolant drip from around the reservoir (gray) cap. The reservoir was definitely under unusual pressure.

My first thought was that I have compression causing excess pressure in the cooling system. The car is not overheating.

Please share your thoughts and suggestions. Thank you.


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Any twenty minute job is just a broken bolt away from a three day ordeal