Fabulous When I brought my Jeep in...I thought my transmission was failing, my check engine had been on for years, and I was getting an average 18mi/ gal. One day later I picked up my Jeep. It's running fantastic! 23-24mi/gal, the engine light is off, and I didnt need a new transmission!!! These guys are great! Quick, professional, great customer service, and extremely reasonable prices! Will def use again in the future