what problems are assosiated with the different colours accumulating on spark plugs?
black and dusty looking?
oily?
brown and chalky?
a colour that looks like corrosion or due to high heat?
any other colour to look out for?
black and dusty looking?
oily?
brown and chalky?
a colour that looks like corrosion or due to high heat?
any other colour to look out for?