# NGK Iridium IX Spark Plug Box of 4 (XR45IX) NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug. - RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs - Trivalent metal plating for superior anti-corrosion and anti-seizing properties - Outstanding acceleration, high fuel efficiency and durability - Fine iridium tip ensures durable and consistent spark This Part Fits: Year Make Model Submodel 1975 Buick Apollo Base 1975 Buick Apollo SR 1975-1977 Buick Century Base 1975-1977 Buick Century Custom 1975-1976 Buick Century Special 1977-1979 Buick Electra 225 1980-1984 Buick Electra Estate Wagon 1977-1984 Buick Electra Limited 1978-1984 Buick Electra Park Avenue 1977-1983 Buick Estate Wagon Base 1976-1981 Buick LeSabre Base 1977-1978,1982-1984 Buick LeSabre Custom 1977 Buick LeSabre Custom Sport 1979-1984 Buick LeSabre Limited 1982 Buick LeSabre Limited Edition F/E 1981 Buick LeSabre Sport 1975-1977 Buick Regal Base 1976-1977 Buick Regal SR 1977-1984 Buick Riviera Base 1982 Buick Riviera Limited Edition 1983-1984 Buick Riviera Luxury 1978 Buick Riviera LXXV Anniversary Edition 1979-1980 Buick Riviera S 1981 Buick Riviera T-Type 1983 Buick Riviera XX Anniversary Edition 1975-1976 Buick Skyhawk Base 1975-1976 Buick Skyhawk S 1975-1977 Buick Skylark Base 1976-1977 Buick Skylark S 1975-1977 Buick Skylark SR 1979-1980 Cadillac Eldorado Base 1979-1980 Cadillac Eldorado Biarritz 1979-1980 Cadillac Eldorado Cabriolet 1976-1980 Cadillac Seville Base 1978-1980 Cadillac Seville Elegante 1977-1978 Cadillac Seville Opera 1973-1974 Oldsmobile 98 Base 1977-1981 Oldsmobile 98 Luxury 1973-1974,1977-1984 Oldsmobile 98 Regency 1982-1984 Oldsmobile 98 Regency Brougham 1973-1974,1977-1984 Oldsmobile Custom Cruiser Base 1975,1977 Oldsmobile Cutlass 442 1975,1980 Oldsmobile Cutlass Base 1980-1981 Oldsmobile Cutlass Brougham 1977 Oldsmobile Cutlass Colonnade 1976-1977 Oldsmobile Cutlass Colonnade S 1980-1981 Oldsmobile Cutlass LS 1975-1977 Oldsmobile Cutlass S 1976-1979 Oldsmobile Cutlass Vista Cruiser 1979 Oldsmobile Cutlass Vista Cruiser Brougham 1978-1984 Oldsmobile Cutlass Calais Base 1983-1984 Oldsmobile Cutlass Calais Hurst 1980-1983 Oldsmobile Cutlass Cruiser Base 1980-1981 Oldsmobile Cutlass Cruiser Brougham 1979 Oldsmobile Cutlass Salon 442 1975-1980,1985 Oldsmobile Cutlass Salon Base 1978-1980 Oldsmobile Cutlass Salon Brougham 1979 Oldsmobile Cutlass Salon Hurst 1975-1984 Oldsmobile Cutlass Supreme Base 1977-1984 Oldsmobile Cutlass Supreme Brougham 1976-1977 Oldsmobile Cutlass Supreme Colonnade 1975 Oldsmobile Cutlass Supreme Cruiser 1975 Oldsmobile Cutlass Supreme Hurst 1981 Oldsmobile Cutlass Supreme LS 1976 Oldsmobile Cutlass Tiara Base 1973-1983 Oldsmobile Delta 88 Base 1980-1981 Oldsmobile Delta 88 Holiday 1973-1984 Oldsmobile Delta 88 Royale 1980-1984 Oldsmobile Delta 88 Royale Brougham 1984 Oldsmobile Delta 88 Royale Brougham LS 1975-1977 Oldsmobile Omega Base 1976-1977 Oldsmobile Omega Brougham 1977 Oldsmobile Omega Deluxe 1976-1977 Oldsmobile Omega F85 1975 Oldsmobile Omega Salon 1976-1977 Oldsmobile Omega SX 1975-1976 Oldsmobile Starfire Base 1976 Oldsmobile Starfire GT 1975 Oldsmobile Starfire S 1976 Oldsmobile Starfire SX 1973-1974 Oldsmobile Toronado Base 1973-1974,1977-1984 Oldsmobile Toronado Brougham 1977 Oldsmobile Toronado XS 1980-1981 Oldsmobile Toronado XSC 1977-1979 Oldsmobile Toronado XSR 1977-1981 Pontiac Bonneville Base 1977-1981 Pontiac Bonneville Brougham 1978-1981 Pontiac Bonneville Safari 1977-1981 Pontiac Catalina Base 1977-1981 Pontiac Catalina Safari 1977 Pontiac Firebird Base 1977 Pontiac Firebird Esprit 1977-1979 Pontiac Firebird Formula 1977-1979 Pontiac Firebird Trans Am 1976-1977 Pontiac Grand LeMans Base 1977 Pontiac Grand LeMans Safari 1977 Pontiac Grand Prix Base 1977 Pontiac Grand Prix LJ 1977 Pontiac Grand Prix SJ 1977-1978 Pontiac Grand Safari Base 1976-1977 Pontiac LeMans Base 1977 Pontiac LeMans Safari 1976-1977 Pontiac LeMans Sport 1977 Pontiac Phoenix Base 1976 Pontiac Sunbird Base 1976 Pontiac Sunbird SJ 1975-1977 Pontiac Ventura Base 1975 Pontiac Ventura Custom 1975 Pontiac Ventura S 1975-1977 Pontiac Ventura SJ ## Details - **Price:** 74.61 CAD - **Vendor:** NGK - **Type:** Spark Plugs ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 74.61 CAD | In stock | ## Images - Photo - Primary - Photo - Primary - Photo - out of package - Photo - out of package --- > Source: [Standard Auto Part](https://www.standardautopart.com/products/ngk-iridium-ix-spark-plug-box-of-4-xr45ix) > Updated: 2026-06-27