most folks who use motor oil do so in a homebrew mix of motor oil and odorless mineral spirits.
Typical mixes are 3 to 4 parts mineral spirits and 1 part oil. Apply to the rollers of the chain and then wipe with a rag until the rag comes away clean. I put the bike in a stand and hand spin the crank for this process. That allows the oil to get inside the roller where it does its work and keeps the bike from getting as messy.