I bought a low mileage AUDI Q5 in May with 18,000 miles. Had oil changed then and then I took it to Audi to have it inspected. In Late July I had the oil changed again. I was driving down the road and the piston blew. Had the car towed to the dealer who said the engine was damaged and has to be replaced. Extended warranty may or may not cover the damage. I have started reading about the Q5 issues and many are related to oil and pistons and engine replacement in Model years 2009-2017. This is a known Audi issue and should be disclosed to consumers.