I have a 36' Regal with 2 454 Mercruisers that needs new thermostat's. With my fathers Searays' - 27 & 34', he always bought the 160 degree thermostat, but the guide says to stick with 142 degree. My father is highly recomending to switch to the 160, but our marine store says that is way to high. Does anyone know the pro's con's, dangers of going to 160?