I've purchased 3 or 4 different stationary air compressors in the past 12 months. None of them shipped with oil inside the air compressor or came with oil to add to the compressor once you set it up. Each manufacturer had large warning tags that said there was no oil and each gave specific instructions on what oil to buy. I'm sure they don't ship with oil to avoid a mess and I suspect if they send the oil with the compressor it would change the status of how it can be shipped (hazardous with oil included in the package?). I think all asked for a non detergent lightweight air compressor oil. Our local hardware store has exactly that. Two choices on the shelves. Detergent and non detergent. Don't use oil with detergent...big mistake...it will foam up and allow oil past the piston rings and contaminate your tank/hoses. Also makes a big stink as the oil compresses in the head of the compressor.