For a Limited Time! One package of 18 standard size Magna-Guard Oil Filter Magnets.
Conduct your own test. Use one magnet per 16 ozs of filter fluid capacity. For best performance, quart sized filters use 2 magnets, gallon size tractor filters require 8 magnets distributed on each from the top to the bottom of the filter. Don't forget use Magna-Guard in your pickup truck, SUV and car.