Nowthat carburators have been in the auto industry's rear-view mirror for nearly two decades, we experience remarkably fewproblems getting the correct amount of fuel into the cylinders. Lighting that mixture off has also become an event thatcan be relied upon, but it's still necessary to occassionally pay some attention to one of the remaining wear items inthe ignition system - the humble spark plug. Worn plugs can cause reduced fuel economy, poor drivability and increasedemissions.
The recommended service interval for spark plugs is usually every 100,000 miles. We'd prefer notto go that long for a few reasons. First, we've seen a few platinum plugs that were rated to go 100K, but which hadeither experienced excessive wear or had completely shed their precious-metal "pucks". Second, the plugs'appearance is one of the best indicators of engine health, and we like to check in on things more often than every timethe odometer's sixth digit changes. Finally, the prospect of successfully removing the plugs dim significantly aftersitting in the heads for a few thousand hours of operation. We think it's a good idea to change the plugs perhaps every50,000-60,000 miles (or sooner, if your vehicle calls for more frequent service).
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