What's everyone's thought on replacing spark plugs and coolant? The owners manual says replace spark plugs at 4 yrs/40K miles and doesn't say anything about coolant replacement but it's been suggested to me that I should replace both at 40K. I'm not sure that either is really necessary. Any thoughts?
By the way, replaced all vacuum lines to remedy check engine light and "Emission Workshop!" warning - thanks for everyone's input.
By the way, replaced all vacuum lines to remedy check engine light and "Emission Workshop!" warning - thanks for everyone's input.