How odd!! Monday morning it was approx. 0 degrees, drove the truck for about 2. 5 hours and all of sudden she shut down. The night before I had put about 1/2 bottle of Power Service treatment in and filled up. Well, had to have it towed to a garage where I could let it thaw out. Pulled the fuel filter and it was waxed over. Just wondering how effective Power Service Products really are?!?