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I've parted out cop diplomats, and I can recall looking at the oil cooler and thinking "what the hell is this thing on it?"

It's funny how sometimes it takes years to piece things together. now I know.

Maintained a whole fleet of Diplomat squads with those oil coolers on them in the early 80's ( all on E58 360 motors). Really no problems other than a few leaks here and there. I think they were designed by a plumber though - not a lot of flow and lines everywhere. I believe the check valve was ball/spring type. No problem but the orifice was pretty small. Really don't think you want any part of one on your car - IMO. BTW, oil back then wasn't anywhere near as good ( regarding heat issues ) as it is today - albit lacking zinc. "Coked" up a few squad motors in the late 70's ( small block Fords ) that didn't have coolers on them.

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