Autolite 5184 Spark Plug

Autolite 5184 Copper Resistor Spark Plug

Autolite 5184 is a copper resistor spark plug built for OE-style service in older GM applications and other listed vehicles. It uses a copper center electrode, nickel ground electrode, and a 0.060 in. pre-gap to support reliable ignition performance, smooth acceleration, and consistent starting.

The Autolite Copper Resistor Spark Plug line focuses on OE form, fit, and function for a wide range of domestic and foreign vehicles. For drivers maintaining a Buick LeSabre, Chevrolet Caprice, or Oldsmobile Custom Cruiser, this plug provides a straightforward replacement option with the correct thread, reach, seat, and terminal style.

Key Features

• Copper center electrode with nickel tip material for dependable spark transfer
• Resistor design with 5,000 ohm resistance
• Pre-gapped to 0.060 in. / 1.50 mm
• 14 mm thread diameter, 0.750 in. reach, and flat seat
• Stud terminal type with 5/8 in. hex size
• Ceramic insulator with mid-projection design
• OE-style replacement for listed applications

Product Details

Autolite 5184 is a standard copper resistor spark plug engineered around common OE specifications. The copper core helps promote stable ignition performance, while the nickel ground electrode and tapered tip design support consistent firing under normal operating conditions. With a 0.060 in. gap and flat-seat construction, this plug matches the requirements called out for the listed Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac applications. This part cross-references Champion Spark Plug 89 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Reduced throttle response during acceleration
• Misfire concerns related to aged ignition components
• Maintenance replacement for OE-style ignition service

Installation Notes and Tips

Verify the engine calls for a 14 mm, flat-seat plug with a 0.750 in. reach and 0.060 in. gap before installation. Check the existing plug condition, inspect ignition wires or coils as needed, and confirm the terminal style matches the vehicle’s ignition lead. For fitment-based searches, this part is commonly selected for 1985-1990 Buick LeSabre, 1986-1990 Chevrolet Caprice, and 1985-1990 Oldsmobile Custom Cruiser applications. Additional listed coverage includes 1987-1990 Cadillac Brougham, 1987-1989 Pontiac Safari, and 1985-1988 Oldsmobile Cutlass Supreme.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and OE channels, and this spark plug follows the brand’s OE-style approach to form, fit, and function. Part number 5184 is built to meet the specifications shown for the listed applications, including Buick Regal, Oldsmobile Cutlass Salon, Cadillac Fleetwood, Pontiac Parisienne, Buick Riviera, Oldsmobile Delta 88, and Oldsmobile Toronado.