NGK 51140 Spark Plug Wire Set 4-Wire with Coil Lead, Blue Silicone

The NGK 51140 (RC-GMX036) is a specific-fit spark plug wire set designed as a standard replacement for select late-1980s Pontiac, Oldsmobile, and Buick vehicles. This set includes 4 wires with a coil lead, featuring NGK's ultra-low resistance magnetic core construction that delivers a stronger, more consistent spark for reliable ignition performance. The blue silicone outer jacket pairs with an inner EPDM/silicone insulation layer to provide excellent dielectric strength and withstand the heat demands of the engine bay.

Key Features:

• Stainless steel winding over a premium ferrite magnetic core for ultra-low resistance and a more powerful spark
• Effective EMI/RFI noise suppression to minimize interference with vehicle electronics
• High-temperature premium silicone outer jacket with EPDM/silicone inner insulation for superior heat and voltage resistance
• 7.0 mm insulation outside diameter; blue insulation color
• 4 straight spark plug end boots (180°) in silicone, brown in color
• Single coil/distributor end boot at 90°, black in color
• Spark plug boots bonded to cable with silicone sealer for a watertight seal
• Stainless steel terminals with up to 3 serrated crimps for maximum terminal retention strength
• Locking C-shaped spring clip with corrosion-resistant plating for a secure, positive spark plug terminal connection
• No wire separators included; specific vehicle fit (not universal)

NGK engineers its wire sets to meet or exceed OE specifications, bringing over 80 years of ignition expertise to every component. This set fits select 1987–1991 Pontiac, Oldsmobile, and Buick models. California Proposition 65 Warning: Cancer — www.P65Warnings.ca.gov.