we use rock oils, we put MP3 Ultra in our customers DFIs (Selva/Yamaha and Mercury) and MP3 sport in all the older non dfi 2 strokes.
we have never had a problem and if you read the details they far exceed Quicksilvers.
One of our customers has a 150 Pro XS and uses it for wakeboarding and his data log has 75% of his hours between 4000-6000rpm. He uses the MP3 ultra and hasn't had a single problem in the last 2 years.
here is a link to the brochure.