The dealer is charging a very a high amount for the 60,000 mile service of my Subaru Outback. I know someone outside the dealership that works on Subarus on the side. If I have him do the 60,000 service will I void the warranty? Right now I have the extended warranty to 100,000 miles. And I did plan on going back to the dealer for future service or should I not?
You are not required to visit your dealership for service to maintain the vehicle's warranty, though you will need to prove you actually performed the required maintenance if something should go wrong with your engine at a later date.
No matter where you take your car for repairs or scheduled maintenance, just be sure you keep receipts for the parts you install, and ensure the mechanic is qualified to perform your services.