CM871 Lots of oil in coolant

[TheBud]

You hit the nail on the head. Old cores were aluminum, new cores stainless.

Dealer supplied diamond shaped metal/rubber gasket type seals instead of o-rings required for the stainless cores. My eager young shop hand had the cores bolted up, as they were with the oval gaskets as it was with the aluminum cores before I could put my coveralls on. How it lasted a month, I'll never know.