2015-2025 Mustang Spark Plug Gap Specs

When tuning up your 2015-2025 Ford Mustang, one of the key maintenance tasks is replacing the spark plugs. Proper spark plug gap is critical to engine performance, incorrect gaps can lead to misfires, rough idling, or even failure to start. The spark plug gap refers to the distance between the center and ground electrodes, and it must match your Mustang’s engine specifications to ensure optimal combustion. A simple spark plug gap tool, available at most auto parts stores, can be used to check and adjust the gap as needed. Below is a quick reference guide to help you find the correct spark plug gap for your S550 or S650 Mustang based on engine type. Be sure to explore our full selection of ignition parts for all 2015-2023 and 2024-2025 Mustang models!

2015-2025 Ford Mustang Spark Plug Gap Chart

Year	V6-3.7L	I4-2.3L	V8-5.0L	V8 GT350/R-5.2L	V8 GT500-5.2L
2015	.049-.053in	.026-.030in	.049-.053in
2016	.049-.053in	.026-.030in	.049-.053in	.049-.053in
2017	.049-.053in	.026-.030in	.049-.053in	.049-.053in
2018		.026-.030in	.049-.053in	.033-.037in
2019		.026-.030in	.049-.053in	.033-.037in
2020		.026-.030in	.049-.053in	.033-.037in	.035-.039in
2021		.026-.030in	.049-.053in		.035-.039in
2022		.026-.030in	.049-.053in		.035-.039in
2023		.026-.030in	.049-.053in
2024		.026-.030in	.049-.053in
2025		.026-.030in	.049-.053in

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