Don't worry about the ground straps how do the ceramic look. You want a slight off white color on the ceramic on the electrode tip. Ground straps can turn all different colors depending on the gas you burn.
On the piston color or tops it is most likely not oil you are seeing but carbon with gas on top. The only way to really inspect the tops of your pistons and be sure is remove the head or use a Boroscope and look through the spark plug holes. No one can look through a hole without a special tool and tell what is going on inside pn top of the pistons in our cars unless there is major obvious damage.
Take a macro picture of your plugs and post it with Mileage and I will tell you if lean/fat or fouled by oil or something else. Best way to read a motor is plugs with a hard run then push the clutch in and cut the motor and pull them and take the picture. Also are you logging with the LM-2? If so you should know if you are running lean/fat and that is the only thing to worry about other then timing being too high under boost
John S |