Car mechanic

Yesterday I took my can for wheel alignment to the Arabian "tyre man" whom I visited on Friday. I brought it to him at 11 am and he phoned me at 2.30 pm that he had finished so I could go for it. We fixed the price 500 NOK. I paid it, he gave the key back and I asked him if he could change the oil as well. He took me aside and showed what kind of oils he had and how much were them together with the wage. I told him that I would like the oil to be changed nowadays. He show me out and told that I should give him a ring while he was rummaging in his pocket. I thought he was looking for his business-card but he surprised me with hundred NOK smiling from ear to ear. Villkomme! - he said - Ring opp! OK?