I recently bought a generator with a 7 HP air-cooled engine (DuroStar DS4000S). The manual recommends using 10w-30 in temps up to about 80 degrees F and straight 30 weight above that. However, I'm sure that refers to conventional oil whereas I would like to use synthetic.
What viscosity synthetic would you guys recommend? I like the idea of a multi-grade oil, e.g. 10w-30, to get better flow at startup. Will a synthetic 10w-30 do the job in 95-100 degree weather that, apparently, a conventional 10w-30 can't? Well it perform as well as conventional straight 30 weight in 100 degree temps?
What viscosity synthetic would you guys recommend? I like the idea of a multi-grade oil, e.g. 10w-30, to get better flow at startup. Will a synthetic 10w-30 do the job in 95-100 degree weather that, apparently, a conventional 10w-30 can't? Well it perform as well as conventional straight 30 weight in 100 degree temps?