Vol, I haven't run anything but Fox 5% with 20% lube that is half castor and half syn, I have about a half gallon through it now and I believe I'll see 9,500 out of it soon running the 18x10 ProZinger. So far it has not quit, hesitated, bogged or shown any other malady and I'm confident it won't. The only bad thing it has done so far is blow most of the pine bark out of my wifes flower garden.
But she doesn't go out there in the winter.