I had a scheduled oil change, but the day before I had to use the 4WD in my suv and forgot to take it back out when driving on dry pavement and went 50mph. I thought I ruined the 4wd shaft when it wouldn't go over 2rpm. Well, I took it in for the scheduled oil change and asked for the 4WD check, etc. These dang new vehicles have so much new technology that I guess I had hit a button that controls my RPMs when going uphill. I did not know it and the vehicle didn't indicate it to me, but Stang figured it out and didn't make me feel stupid. They were very helpful and even made sure that was the issue by taking it out twice for a test drive. They didn't even charge me for my ignorance. These guys are great! Kind and helpful!