I don't know of any disadvantages but the advantages I've seen is that the heater works a whole bunch better than before. Before it took for ever to get the cab warm now it can get 3 degrees cooler than hell inside (the wife loves it...).I think the truck runs better with it but that could be me wishing. It's supposed to put the engine at a better operating temp and even under a big load it doesn't seem to move hardly any. Before you could see it climb but now it stays pretty much in one spot. It's a cheap change that should make the engine more efficient and if nothing else it makes the heater work better.