I’ve run both oils. I now only use Stihl Ultra HP.
I have no doubt that the Sabre was GREAT oil. I just couldn’t bring my self to run the mix leaner that 50:1. When I mixed the Sabre at 50:1 if I didn’t run my string trimmers hard, they would eventually accumulate lots of oil in the mufflers. The only way to avoid this is running the trimmers hard and full throttle all the time. Or run a leaner oil mix. Which I just didn’t feel comfortable doing.
The only problem I had with the Ultra HP was on my hand held BG56 blower. It clogged the spark arrest fairly quick. I guess it could be running slightly rich on the gas. But it doesn’t seem like it.
All my other equipment has done great with the Ultra HP. No problem so far. I’ve been running it for at least 6-7 years now.