I know most people go to dealer services because they think dealer will void the warranty if they did the services somewhere else. It really depends on how much trust you can rely on the mechanic, dealer or local one. I went to the dealer for oil change services till 40 -50k miles. The dealer never told me that the front CV boot was leaking & should be covered under warranty. Guess what, when I had my suspension services at my local mechanic (covered under my 100k extended warranty purchased from the dealer), he noticed the leakage at one of the front CV boot & told me to get the dealer fixed it under warranty. Indeed the dealer had to order that $1000 front axle with the CV boot on the passenger side & changed it under warranty. All these years dealer didn't bother to fix it in oil change services.