Dee uses Lucas Fuel Treatment in 2003 GMC Yukon

Before hand, my Yukon was piston slapp'n like nothing. I was desperate. Dealer said it was common for GM trucks to knock like that. I wasn't satisfied, so I asked around for a solution. One guy from this auto parts store said to use Lucas Oil products. I tried it and wala, most of the noise went away. I then applied a second treatment, It's all gone. I guess my engine needed some upper lubb'n.

Dee

Hawii