It doesn't lubricate; also gasoline or alcohol doesn't do much there. 4-stroke engines have oil chamber to do it. Nitrogen emissions from the burning process te

It doesn't lubricate; also gasoline or alcohol doesn't do much there. 4-stroke engines have oil chamber to do it. Nitrogen emissions from the burning process tend to contaminate the oil a bit but overall, CNG and bi-fuel cars are a long-established technology (e.g. I rode in many taxis running on gas in China around the year 2000).