Sandy, we're so sorry that you were embarrassed by our "lectures". We just want to make sure our customers know trhe importance of low cost oil changes to make sure your vehicle investment last a long time. Ray has been doing this work for over 35 years and finds that oil changes should be done every 3,000 miles for regular oil and 5,000 miles for synthetic oil. The dealer does usually recommend longer intervals but with our customer's as well as our personal vehicles this has not proven to be the best maintenance for the vehicles. Vehicles last much longer with less engine issues if the maintenance is done with the frequency outlined above. Again, we apologize for the lectures and appreciate your long time business at the shop.