Last Sept 2008, I brought my brand new Silverado to Grease Monkey for a complete Oil & Filter Change. I bought the most expensive filter and oil in the market - Mobil 1. Last Dec, my son noticed oil spots under my truck. Being a brand new vehicle, I took it to the dealer Bender Chevrolet to have it looked at. To make a long story short, I had to bring it again to the dealer just today to check again on the oil leak. According to the Service Manager- Richard of Bender Chevrolet in Clovis; his expert technicians found out that the Oil Filter needed ONE and a Half turn to tighten; and also found the Oil pan lugnut to be loose. This inconvenience caused me about $50 bucks. I contacted Eric - manager of Grease Monkey and he declined to renumerate me nor take responsibility for the mistake that his company did. I PROMISED him that I will be a walking, talking NEGATIVE ADVERTISEMENT for Grease Monkey; not only did he lose me as a cusotmer - with 4 vehicles. I will also make sure that everybody I know will hear about this. My phone number is Cell [protected] if anybody wants to verify this very bad and potentially expensive bad experience from Grease Monkey.