Mineral OilsMineral oils (petroleum oils) have long been used in various types of compressors. Their use in rotary screw compressors was common until the 1980’s. Some manufacturers factory filled with motor oil and some used automatic transmission fluid. Mineral oils began to lose favor when oil recyclers began to charge for oil disposal. With oil change intervals as low as every 1000 hours, many manufacturing plants had to change eight times per year. An advantage of frequent oil changes is that contaminants in the compressor are removed with the waste oil. In highly contaminated environments, mineral oil is still used for this reason. Mineral oils have the disadvantage of a complex mix of natural hydrocarbon molecules. There are waxes that solidify at low temperatures, volatile components that vaporize and natural mineral oils tend to oxidize quickly, forming varnish and sludge, when exposed to high temperatures and elevated pressures.
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