I've run Yamalube through my 1993 Yamaha 85hp since I bought it in 2005 and had no problems at all...in fact I'd say it performs most excellent.
I did use some Quicksilver Premium this past summer since i was in a bind and that was all that was available. I didn't notice any changes in temp, rpm's vs speed, etc, but maybe a few quarts isn't enough to make a difference?
I'll probably stick with the Yamalube as much as possible. It's been good to me, so I'll stay loyal to it.
I always add a few drops of Ring Free too.
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