You will foul the plugs or degrade the quality of the plugs enough to warrant changing.
Dont waste your time with Seafoam. Its a half assed product. Goto GM Dealer and get a bottle of the Top End Cleaner. Now that is a good product! WAY more potent that Seafoam. Works the exact same.
Just buy some cheap Autolite copper plugs at walmart. Install, use the Top End Cleaner, then put on a few miles (few hundred). Replace with good plugs and enjoy.
Also 40 PSI on your tires? Seriously? In the Alero are you not only supposed to have like 28 PSI? When you over inflate you loose traction and also wear the middle part of the tire faster...
__________________
-Ryan
|