When I did it last year I put 1/3 in the tank, 1/3 in the crankcase, and 1/3 through the brake booster hose. I then changed the oil about a week later.
It definitely made the motor idle smoother, and I gained 1.2mpg throughout my usual commute.
When I did it last year I put 1/3 in the tank, 1/3 in the crankcase, and 1/3 through the brake booster hose. I then changed the oil about a week later.
It definitely made the motor idle smoother, and I gained 1.2mpg throughout my usual commute.