A few months ago I brought my Yukon XL to the dealership to be repaired for an oil pressure issue. Even after the initial repair (which involved changing out a sensor and replacing a valve component) I still had issues. Upon return, the dealer said there was nothing more to do except to replace the engine, a hefty expense especially after the front differential had just been replaced! Wanting a second opinion, I took the car to Bobby Likis over the Thanksgiving holiday. I had an appointment for Friday, but they were able to see it early. The diagnostic fee was worth it to me to determine whether I wanted to gamble on a new engine or not. During the diagnostic process, they called to get approval to go further into the engine to look for the cause of the issue because it upped the cost of the initial fee. Not being a car person, I don't know the exact technical details, but they determined the cause and replaced the offending parts. Deciding to take the car to Likis saved me from buying a "new" engine, quoted by the dealer as $8000, and spending less than $1000 instead to repair the problem. I returned a few months later to have some additional recommended repairs performed on the front axel and they found some other issues that had been overlooked by the shop that replaced my differential in the fall, such as differential fluid that was practically as black as tar. I am grateful for their assistance, especially in keeping my 200k+ mile car on the road. The staff is always willing to take the time to answer my questions and to help educate me about the issue I am having. Previously, they were a back up shop to get second opinions at, but after this latest series of visits I will be using them primarily from now on.