I have my car apart to clean the intakes and replace a few lines (69k miles). I bought a ste of plugs, but only single plat's. Both the dealer and the auto parts store said they were OEM? They are Auotlite, should I return them and get the double plats? The single were $3.5/ea and thye 2x were like $7/ea (or $8/ea from the dealer).
