I wish I had had more information about why the preventive maintence was a good idea. I am 80 years old, the car is11 and I don't drive much, no long trips. However I feel the car is safe and that gives me peace of mind. I paid in cash but was not given a receipt for the payment. When I went back I was told they don't give receipts, however she did Mark the bill 'paid'. Since I paid in cash this is all the proof I have. Don't think there would ever be a problem as they seem honest. I love the shuttle service and their work seems excellen. I would recommend the shop.