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The ACDelco 41-156 is a single iridium spark plug sold as GM Original Equipment, the same part GM installs or validates for its engines. The iridium center electrode resists heat and wear better than copper or platinum plugs, so it holds its gap longer and needs fewer changes. It suits GM owners replacing plugs at the factory interval or chasing a misfire. Against aftermarket iridium plugs it wins on exact OE fit and heat range rather than on exotic materials.
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Lowest price we've seen: $3.60 on Nov 13 at elettrodomestici.shop. Tracked across 4 stores since Nov 13.
Buyers rate it highly and mostly report it as the correct OE plug that fixed misfires and rough running. Complaints center on single-plug packaging and occasional doubts about authenticity.
The ACDelco GM Original Equipment 41-156 is an iridium spark plug. It is sold as a single plug. It is designed, engineered and tested to rigorous standards and is backed by General Motors.
It is an exact replacement for the original spark plug in a GM vehicle. ACDelco GM Original Equipment parts are the true OE parts installed during production of GM vehicles or validated by General Motors for them.
The iridium composition gives the plug a high melting point and great strength. It also provides excellent wear resistance and durability.
