Originally Posted by whofan
The oil smells like ammonia. very thin in viscosity.
I used HPS synthetic at 100:1 back in the 80's on jet skis, dirt bikes, and three wheelers. (Not the Royal Purple HPS oil, HPS was the name of the company) Absolutely fantastic stuff. No smoke, no fouled plugs ever, much better throttle response and more power (seat of pants dyno). It too smelled like ammonia, and burned your skin similar to battery acid if you got any on you and didn't wash it off real good. Sadly, they went out of business, but I had enough stock in my garage to last years.