I had some issues with Power plus a few years ago. Clogged injector screens and burned 2 pistons but it was just as much my fault as it was the lube due to lack of maintenance. Car sat 7 months and I moved 1500 miles and never cleaned the system before running it.
Also had some trouble with Redline, seems it was falling out of suspension. I ended up with a gooey puddle of lube on my intake plenum and at hard acceleration it would actually foul a couple of spark plugs momentarily.
I have been using Klotz Uplon for 5 years now, 1/2qt per 55gal drum and my carb/fuel system has been perfect.