Coolant in oil after new headgaskets...

[kday]

It's a long story, but suffice it to say that I bought a new used motor for my A6, and after many months of working on it sporadically it's now installed and the car is back together. While I had the replacement motor out of the car I replaced all gaskets and seals, including the head gaskets. I have no reason to believe there was any problem with this motor before I got it -- I replaced everything "while I was in there"... Anyway, after a total of about 10 minutes of idling and 5 minutes of driving (w/ smokescreen coming from the tailpipe) with the new engine, there was something like a quart of coolant in the oil. The oil was very thin and watery. The coolant was slightly brown, but it seems most of the contamination was in the water->oil direction. (I am leaving out the part of this story where I seriously debate the merits of driving this car into the Mystic River and claiming that it was stolen.) So far I have done the following: - Separate oil cooler from pan. Pressurize cooling system to 25 PSI. No drips from cooler. - Leak down test on all cylinders. Consistent readings, no bubbles in the coolant tank. - Tighten all head bolts (new w/ gasket) 1/4 turn. - Pressurize coolant system at 15 PSI and leave overnight. There was a small puddle this morning near the oil drain. This leads me to believe that there is still a slow leak. I did not send the heads to a machine shop when I had them off. I cleaned them up with a roloc pad and reassembled. I am looking for ideas on what else I can try before pulling the heads and having them machined.

[asv4k8]

try refilling the engine now that its semi flushed out. The coolant and oil could have been sitting in the wrong sections from when the motor was disasembled....just a guess

[kday]

However, I will definitely try refilling with fresh oil before I do anything significant...