Hi guys,the other day i mowed a paddock with the ride-on and the old victa 160 two stroke.the victa coughed and spluttered (unusual)so i was wandering if i should be using 98 rated octane fuel to mix my 25-1 fuel,caltex vortex or bp ultima,remembering that when i was a kid the only fuel was (super or standard)as well my two strokes and four stroke are of the 70s/80s era...ken