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If CTIS is off and the truck is sitting, idling, once the tanks are aired up the compressor should only cycle once every 10 or 15 minutes. If it's once a minute, you have a big air leak. The spec is for it to kick in at 90 PSI and shut off at 130 PSI. If the dryer is fouled up (often seen in...

If the oil is thin, like crankcase oil and not heavy diffie oil, it could be blow-by from the air system. If the dryer isn't serviced and there are/were air leaks causing the compressor to cycle frequently, oil will collect in the CTIS system. It all depends on how much oil and how thick. If...