air compressor oil or oilless?

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Have you actually looked at an oilless compressor, or are you just guessing? Where is the bronze bearing you are talking about?
I have an oilless Sears compressor. The motor and crank bearings seem to be sealed ball bearings, so no oil is needed there (unless you want to count the oil that is part of the grease that is packed into the bearings). The piston rings are apparently some sort of graphite that slides dry on the cylinder liner. Thus, the air is not exposed to oil at all - which is the real point of an "oilless" compressor. No bronze bearings in sight.
Oil-lubricated compressors have a crankcase, and use oil lubricated bearings and the piston is oil lubricated. This apparently gives lower piston wear and longer time between rebuilds, but you end up with a bit of oil in the compressed air.
    Dave
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