Filling An Oasis With Oil?

Im running an Oasis in my truck but i havent got the dipstick or bottle of oil from the shop that installed it for me yet because i wanted it for a show and they just forgot to give it to me. I was just wanted to make sure i knew where to fill it with oil. If you are looking at the compressor from the air filter end, do you fill it on the ride side with the bolt or the left side where you check the oil with the dipstick?