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CPS and rear main seal. 200 1990

More likely the rear cam seal and or rear cam seal plug if you have a block-driven distributor. Check the back of the head. The plug can come out and cause a CATASTROPHIC loss of oil. Very worth checking that it's in one piece and still installed. There is information on this in the FAQ.

The rear main seal would be leaking out the bottom of the transmission. Maybe, just maybe (but I really doubt it) a little could creep up if the RMS were leaking badly. But you'd get a lot more coming out the bottom and be losing oil to the tune of a quart every couple thousand miles or more.

The oil on the sensor won't interfere with its operation, but it will degrade the plastic and insulation on the wiring.

Cheers






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