Aurelio has known John for a long time and instantly recognized his car when Iosef brought it to him to have documents forged and VIN changed. Angered upon learning Iosef had killed Wick's dog as well as stealing his car, he punched Iosef in the face, before demanding he exits his shop. John later paid him a visit, where he immediately told Wick who was responsible. He later received a call from Viggo who asked him why he had struck his son, Aurelio told him what Iosef had done to John. Viggo understood immediately.
A few days after the deaths of Iosef and Viggo, Aurelio located John's car for him with a few phone calls. After retrieving it, John called Aurelio who was upset at the mess John had made of his car but promised to be able to repair it.
After the bounty on John was made international, Aurelio was one of those who received it.
Aurelio is a very skilled mechanic after Wick retrieved his car, he called Aurelio to have it fixed. Aurelio commented on the poor condition of the car, though he assured John he could fix it, though it would take him time.