08-30-2007, 07:29 PM
Czech-it-Out Graphics Wrote:black is carbon build up, that is due to running rich and you will see that on the top of the piston only. You dont need after run oil, it really is pointless and will only foul plugs if u run a good fuel. Run the motor out of fuel and you are left with an oily mess, there is your after run oil. you just dont want to leave un burnt fuel in the motor that is what creates the rust
ya i had some carbon or black stuff on the piston of my old v-spec with like 4 gallons on it. I just got a papertowel and rubbed it off so i don think thers really a need for afterrun.