Rotary screw air compressors generally use synthetic lubricant. Reciprocating (piston) air compressor typically use an oil of some sort. Like most vehicles, changing the oil extends the life. Brands here include Ingersoll Rand (IR), Chicago Pneumatic (CP), Campbell Hausfeld, Jenny as well as our own to save you money. Various sizes available, pints quarts, gallons, liters.
Please give us a call here at Portland Compressor if you need help finding the right lube or can't find what you are looking for.