Autolite APP5243 Spark Plug

Autolite Double Platinum Spark Plug APP5243

Autolite Double Platinum Spark Plug APP5243 is built for drivers who need OE-style ignition performance with platinum-to-platinum firing for longer service life. It is a direct-fit spark plug choice for a wide range of Chevrolet, GMC, Cadillac, Pontiac, and Oldsmobile applications, including Silverado 2500 HD, Sierra 3500 HD, and Escalade models.

Key Features

• Double platinum design for platinum-to-platinum firing
• Platinum center electrode and platinum ground electrode tip
• 0.044 in. pre-gap size, with application-specific gap notes in fitment
• 14 mm thread diameter, 0.679 in. reach, tapered seat
• Long projection ceramic insulator for OE-style fit and heat control
• 4000 ohm resistor for ignition system noise suppression
• Stud terminal and 5/8 in. hex for standard service tools

Product Details

The Autolite Double Platinum Spark Plug line is engineered for easier starts, quicker acceleration, and improved fuel efficiency compared with worn plugs. APP5243 uses platinum on both the center and ground electrodes to help maintain consistent spark performance over time. As an OE-form, fit, and function replacement, it is suited for drivers servicing GM trucks, SUVs, and performance cars that call for this plug specification. This part cross-references Monroe Shocks & Struts (e.g., 41-952, 88901020) for the same application.

Compatible With applications such as 2011-2019 Chevrolet Silverado 2500 HD, 2013-2019 GMC Sierra 3500 HD, 2007-2016 Cadillac Escalade, and 2010-2015 Chevrolet Camaro, APP5243 supports a broad range of factory-style ignition setups. The part number APP5243 is also commonly searched as Autolite APP5243 spark plug for GM truck, SUV, and performance car maintenance.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle and inconsistent combustion
• Reduced throttle response during acceleration
• Misfire concerns related to aged ignition components
• Fuel economy loss from degraded spark performance

Installation Notes and Tips

Verify the vehicle-specific gap listed in the fitment notes before installation. Some applications call for 0.040 in. (1.0 mm), while others list 0.030 in. (0.8 mm), 0.045 in. (1.1 mm), or 0.050 in. (1.3 mm). Confirm thread diameter, reach, seat type, and terminal style against the original plug before service. Use the correct 5/8 in. spark plug socket and follow the manufacturer’s torque specification for the engine.

• Fits 2011-2020 Chevrolet Express 2500, N/A
• Fits 2011-2020 Chevrolet Express 3500, N/A
• Fits 2013-2020 GMC Savana 2500, N/A
• Fits 2013-2020 GMC Savana 3500, N/A
• Fits 2011-2019 Chevrolet Silverado 2500 HD, N/A
• Fits 2011-2019 Chevrolet Silverado 3500 HD, N/A
• Fits 2016-2019 Chevrolet Suburban 3500 HD, N/A
• Fits 2013-2019 GMC Sierra 2500 HD, N/A
• Fits 2013-2019 GMC Sierra 3500 HD, N/A
• Fits 2013-2017 Chevrolet Caprice, N/A
• Fits 2014-2017 Chevrolet SS, N/A
• Fits 2007-2016 Cadillac Escalade, N/A
• Fits 2007-2016 Cadillac Escalade ESV, N/A
• Fits 2009-2015 Cadillac CTS, N/A
• Fits 2010-2015 Chevrolet Camaro, N/A
• Fits 2013-2015 GMC Savana 2500, N/A
• Fits 2013-2015 GMC Savana 3500, N/A
• Fits 2013-2015 GMC Sierra 2500 HD, N/A
• Fits 2011-2014 Chevrolet Express 1500, N/A
• Fits 2013-2014 Chevrolet Suburban 1500, N/A
• Fits 2010-2014 Chevrolet Tahoe, N/A
• Fits 2013-2014 GMC Savana 1500, N/A
• Fits 2013-2014 GMC Yukon, N/A
• Fits 2013-2014 GMC Yukon XL 1500, N/A
• Fits 2007-2013 Cadillac Escalade EXT, N/A
• Fits 2013 Chevrolet Avalanche, N/A
• Fits 2006-2013 Chevrolet Corvette, N/A
• Fits 2011-2013 Chevrolet Silverado 1500, N/A
• Fits 2013 Chevrolet Suburban 2500, N/A
• Fits 2013 GMC Sierra 1500, N/A
• Fits 2013 GMC Yukon XL 2500, N/A
• Fits 2006-2009 Chevrolet Impala, N/A
• Fits 2009 Pontiac G8, N/A
• Fits 2006-2007 Cadillac CTS, N/A
• Fits 2003-2006 Chevrolet SSR, N/A
• Fits 1991-1995 Chevrolet Lumina, N/A
• Fits 1995 Chevrolet Monte Carlo, N/A
• Fits 1991-1995 Oldsmobile Cutlass Supreme, N/A
• Fits 1991-1995 Pontiac Grand Prix, N/A

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, and this spark plug is built to OE form, fit, and function standards for the listed applications. Part number APP5243 is designed for service replacement on a wide range of GM vehicles where the specified plug dimensions and gap requirements match the engine application.