I added the magnets Saturday, drove the truck Sunday and they are still on today. This truck is expensive to operate and takes 15 quarts of oil for an oil change. I buy the oil in a 5 gallon bucket.

I sprayed the bottom of the filter with brake cleaner and rubbed the bottom of the filter vigorously with a clean rag to remove any oil film. Then a dab of silicone sealer to each magnet and let dry for a few hours. I did the same to the gas fueled truck.

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