[mrtiffin]

I have oil coolers in the radiator. I did a pressure test about 2 months ago and most of the numbers were ok. I put rislone in the case and have yet to repeat the test. I think that plugging the system would be a bad idea considering I live in Houston, TX and drive about 30-35K miles alone in the city in each vehicle. 70 mph+ on average.
I don't think (for the amount of emulcified oil in the water) that the PO added any. I think the 25 yr.+ old radiator/oil cooler/ who knows what else, should probably be replaced. If others say plugging is not a bad option, then I might go ahead and do it.
btw, car is almost ready to finally turn over. More updates in another post.