High-Mile BMW E92 M3 Dyno Test Shows Importance Of Good Spark Plugs

This stock 2010 BMW M3 has 152,000 miles and is a little down on power due to the spark plugs, which aren't as effective after just 30,000 miles.
This stock 2010 BMW M3 has 152,000 miles and is a little down on power due to the spark plugs, which aren't as effective after just 30,000 miles.

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