GM recommends checking and if necessary replacing your spark plugs every 35,000 miles.

Iridium Spark Plugs are our latest in spark plug technology and an exact replacement for your vehicle’s original components. Iridium composition of the spark plug provides a high melting point and great strength, and provides excellent wear resistance and durability. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function.

FEATURES & BENEFITS
Iridium offers excellent engine idle stability and smooth performance
Iridium allows for small, efficient electrode designs for reliable cold starting and quick acceleration
Iridium fine-wire electrode helps burn away carbon deposits on the tip of the plug as they form
One piece suppressor seal helps block radio frequencies that can affect vehicle electronics
Suppressor seal meters spark energy for long electrode life and helps prevent combustion leakage
As spark plugs fire at an extremely high rate, these Iridium Spark Plugs are under constant chemical, thermal, physical and electrical attack by corrosive gases that can reach upwards of 4,000 degrees Fahrenheit

It is also recommended to check and replace spark plug wires at spark plug maintenance interval.