Description Bosch OE Fine Wire Platinum Spark Plugs feature a specially engineered, yttrium enhanced ground electrode that provides 2X longer service life compared to standard copper plugs Unique 360 degree, continuous laser welded fine wire platinum firing pin design delivers better corrosion resistance, ignitability, and performance Ribbed insulator design seals tightly against the wire boot preventing misfires due to flash-over Nickel-plated rolled threads provide superior resistance to corrosion and do not require anti-seize for installation Bosch Platinum spark plugs are pre-gapped at the factory and do not require a gap adjustment prior to installation Compatible with select vehicles including, but not limited to, the following (Note: engine affects fitment – verify specific fitment details with amazon confirmed fit fit checker above): BUICK: 96-01 Century, 94-95 LeSabre/Park Avenue, 88-91 Reatta Compatible with (cont): BUICK: 90-91,94-96 Regal, 88-91,95 Riviera, 96-98 Skylark; CADILLAC: 87-93 Allante, 84-95 DeVille, 84-94 Eldorado, 84-92 Fleetwood, 84-94 Seville; CHEVROLET: 96 Beretta/Corsica, 92-96 Corvette, 97-00 C2500, 99 C2500 Suburban Bosch OE Fine Wire Platinum Spark Plugs deliver improved ignitability and fuel efficiency. The fine wire design with a platinum firing pin on the center electrode and tapered ground electrode are an economical upgrade from conventional copper core spark plugs. Nickel plated, rolled threads, combined with a factory preset gap, ensure simple, easy installation right out of the box – no anti-seize or gapping necessary. Engineered to meet or exceed Original Equipment specifications for platinum spark plugs.