Spark plug part numbers and gaps: reading the manual
Owner’s manuals name spark plugs in different ways: a maker’s part number (NGK, DENSO), the car maker’s own part number, or both. Use the plug listed for your engine, because different engines in the same model often take different plugs.
Several numbers can mean one plug
- 2019 Chevrolet Equinox: each engine has a GM part number and an ACDelco number. For the 1.5 L that’s GM 12673527 or ACDelco 41-153; for the 2.0 L, GM 12647827 or ACDelco 41-125.
- 2017 Honda Civic Sedan: the manual lists three plugs for the 2.0 L (NGK DILKAR7H11GS, NGK DILKAR7G11GS or DENSO DXE22HQR-D11S), and a different NGK plug for each 1.5 L version.
- 2021 Honda Accord: the same NGK DILKAR8P8SY is listed for both engines. Two engines sharing a plug isn’t a typo here.
Gaps
Some manuals print a gap (the space between the electrodes). The 2019 Equinox lists 0.024–0.028 in for the 1.5 L and 0.030–0.035 in for the 2.0 L. Many modern plugs come pre-gapped: the 2021 Chevrolet Malibu manual says “spark plug gaps are preset by the manufacturer” and advises against re-gapping. Where a manual prints no gap, use the plug as supplied.
Spark plug changes are usually listed in the manual’s maintenance schedule; follow that interval for your engine.