Do Not Mix Lubricants!!I had a customer call and had a positive displacement blower that needed oil. He said “I have some compressor oil – can I use that in the blower?” I have had others call stating they had a rotary screw compressor using mineral base oil (typically ATF or equivalent), and wondered if he could top-off with synthetic lube. Both are recipes for disaster.
In the first case, positive displacement blowers require a higher viscosity oil than rotary screw compressors. Typically, they will require a viscosity index of ISO 220 oil (40W SAE). Rotary screw compressors will typically require an ISO 46 (for synthetic lubricants). The ISO 46 is much too thin to provide proper lubrication to the gears and bearings of a positive displacement blower. Conversely, the ISO 220 blower oil will be too heavy and thick for use in the rotary screw compressor, starving the maintenance and greater reliability compressor for oil.
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