Fire a strong, focused spark and keep every cylinder lighting off cleanly with the Autolite XP605 Iridium XP Spark Plug. This iridium plug is a direct-fit replacement across a large list of GM applications, from the 1988-1992 Buick LeSabre [V6-3.8L] and 1989-1992 Buick Skylark [V6-3.3L] to the 1996-2005 Chevrolet Blazer [V6-4.3L], 1996-2000 Chevrolet C2500 [V8-5.7L], and 2004-2006 Cadillac SRX [V8-4.6L] — 242 applications in all. See the "Vehicles it fits" section for the full list.
- Iridium fine-wire center electrode: an iridium-enhanced, fine-wire center electrode with a copper core, designed to improve ignitability and provide a more focused ignition.
- Platinum taper-cut ground electrode: a proprietary platinum ground electrode with a taper-cut tip, designed to increase durability and resist wear.
- High-alumina multi-rib ceramic insulator: provides thermal conductivity and insulation while helping prevent flash-over.
- Nickel-plated, corrosion-resistant shell.
Specs: 14 mm thread (M14-1.25), 5/8 in hex, tapered seat, 0.679 in (17 mm) reach, manufacturer heat range 8, pre-gapped to 0.06 in (1.5 mm), and a 4000-ohm resistor. Washers are not included. Country of origin: Mexico. Backed by a lifetime limited warranty. Manufacturer part number XP605.
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
41-948, 6723, 8119, HR9DI33Y, 3015, 7408, 9404, RS14WYPB5, 4714, IT20, IT20TT, 1U1E124405AB, 38, AGSF42FCM, AGSF42FM1, SP438, 7164, PTR5C-13, TR55-1IX, TR55IX
Frequently Asked Questions
What is the Autolite XP605?
It's an Iridium XP resistor spark plug with an iridium-enhanced fine-wire center electrode and a platinum taper-cut ground electrode, seated on a high-alumina multi-rib ceramic insulator.
What are the key specifications?
14 mm thread (M14-1.25), 5/8 in hex, tapered seat, 0.679 in (17 mm) reach, manufacturer heat range 8, pre-gapped to 0.06 in (1.5 mm), and a 4000-ohm resistor.
How many spark plugs do I need?
Quantity varies by engine — listed applications use 4, 6, or 8 plugs. Check the "Vehicles it fits" section for your vehicle. Plugs are sold individually.
Are gasket washers included?
No, washers are not included. This plug uses a tapered seat design.
What are signs a spark plug may need replacing?
Rough idle, misfires, hard starting, hesitation, or reduced fuel economy can be signs. Diagnose the cause first; if worn plugs are the issue, replacing them with this plug addresses it.
