I have Audi Q7 2007 3.6. I had get oil changed on April 30th 2017 Thursday. on April 4th 2017 Saturday i was driving it on high way at 70 mph and suddenly see low oil pressure light. I stopped at the side of the road immediately and open the hood and there was engine clicking noise coming. I checked oil in the sump with dipstick it has right level oil oil. I called road assistance and got it toed to my house. Can someone help me in understanding what is going wrong. Can it be due to recent oil change (if mechanic didn't use right quality of oil and filter) or is it something else. Is it a major repair (expense)?