However, if you can't find the manual, a good starting point would be to look for plugs that meet these general criteria:
* Heat Range: This is crucial. Too cold and you'll foul plugs; too hot and you'll risk pre-ignition. Finding the correct heat range is vital, and again, your owner's manual is your best source. If you can't find that, a reputable auto parts store (like AutoZone, Advance Auto Parts, or NAPA) can help you determine the correct heat range based on your engine's application.
* Type: Common choices for this engine would be copper-core plugs (generally inexpensive and readily available) or platinum/iridium plugs (which offer longer service life but are more expensive). Copper is a perfectly acceptable option for this engine.
* Gap: The spark plug gap is also critical for proper ignition. The manual will specify the correct gap, but if not, the parts store can advise on the proper gap setting for the plugs you choose. You will need a gap tool to adjust this if necessary.
* Brand: Many reputable brands manufacture spark plugs, including ACDelco (GM's own brand), NGK, Bosch, Champion, and Denso. All these brands make quality spark plugs, so choosing a brand comes down to preference and price point.
In summary: Don't guess. Find your owner's manual first! If you can't find it, take your VIN number to a reputable auto parts store and they can look up the correct spark plugs for your specific car. This is the best way to ensure you get the optimal performance and longevity from your engine.
