Synthetic oil holds up well to heat and maintains it's viscosity much better than conventional motor oil, so I see why it is ideal for your hydro systems. Why dont you say to use mobil 1 in our engines after they are broke in? #1 cause of small engine wear is dirt and #2 is heat. If you replace your stock air filter with a K&N air filter and use Amzoil oil filters, (filter traps dirt particles down to the size of 1 micron) You will have cleaner air entering your engine and the amzoil oil filter will remove the dirt that the oil picks up. Top that off with mobil 1 synthetic and you will have a longer life out of your engine.