When you are towing, your truck is loaded down and the heat climbs. If the fluid fails, the transmission fails. It's as simple as that. You want to make sure you have a high quality product especially when you are doing the amount of work these trucks are doing. When we are building these products in the lab at AMSOIL, we take these things into account - we know that these trucks are going to have to work, we know that heat is going to be there. So when you put an AMSOIL product in your transmission, you aren't going to experience slip, you aren't going to experience heat failure, you can rest assured that the transmission is protected.