Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Autolite Spark Plugs

I bought these for my '05 Mercury Mariner with the 3.0L V6 motor. Well packaged and arrived in good condition. Remember to check the gap and put anti seize on the threads before you install. Also remember to put dielectric grease on the COP lead from the coil before snapping the lead on the spark plug tip. Improved my gasoline mileage by about 3 mpg according to my dashboard mpg readout.