My mech buddy and I changed out the spark plugs @ 77k miles. One had bad water corrosion (we think). We used new OEM plugs. I'm hoping this improves my mpg. What could cause this? Bad gas?
My mech buddy and I changed out the spark plugs @ 77k miles. One had bad water corrosion (we think). We used new OEM plugs. I'm hoping this improves my mpg. What could cause this? Bad gas?