Originally Posted by jh7
yeah it's not free, they want to charge me $300 for it. seems like it's not needed. is there any way for me to measure this or check if i need to get this done?
Yep, the dealer is just trying to sell stuff that's all. They offered me the same thing but my car is only at 15k miles. How did your SA determine the % of carbon buildup? Only way to tell that I could think of would be to use a 5-gas analyzer. Look at the emissions reading before and after the procedure at idle and at 2000rpm. Pay close attention to carbon and Nox readings.