NGK Iridium IX Spark Plug Box of 4 (XR45IX)
Special Order
This part is still available to order. Once you place your order, we’ll submit it directly to NGK, and they’ll ship it straight to you.
Delivery times can vary depending on the brand, so we can’t guarantee an exact arrival date. What we can guarantee is that we’ll stay on top of your order, monitor its progress, and keep you updated until it reaches your door.
Special-order items are typically not kept in stock by most retailers. By ordering through us, your order is placed directly with NGK, assuring you get the part as quickly as possible.
Want to get an estimated delivery timeframe before ordering? Contact us through our contact page, and we’ll be happy to find out for you.
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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 |
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