Currently I using straight 30 in my 743 winter starting are very dificult. If Iwould use sythetic instead would the 743 accomodate and make easier starting in winter . Also if would use synthentic in m hydraulic during winter would they run better bob cat insist in there manual thyat I use straight 30 evrywhere. Sometime it so cold the machine make a whole bunch of noises that why I need your opinion on going synthetic everywhere. thank in advance OLIVE