I recently called High Octane from the "dealer" about my 1998 Cadillac STS. I had broke down over the weekend and they were still open. I had a bad coolant leak and was really at their mercy. They called me on Monday morning and gave me a qoute of over $3500 for head gasket leaks !!!! . I called High Octane and spoke to Charles , he told me that although that car is known for head gaskets he assured me that it would not be an leak I would see on the ground. I towed the car out and they found the real problem... the radiator tank split, they replaced the radiator tanks and coolant and I was out for less than $450 dollars. I was so impressed, they knew it wasn't the big problem and saved me so much money. They even gave me a ride to work and back..... Highly recommend this shop