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I would recommend you locate the information tag on the compressor and write the manufacturer for a maintenance schedule, if your PO did not provide the original documents.
I have a Thomas on mine, but it is an "oiless" type, not requiring any maintenance other than replenishing the oil reservoirs on the motor bearings.
FWIW, the compressor in the '87 is NOT original, so it has been replaced at least once.
Good luck!
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