Anyone add a tiny bit of two stroke synthetic premix oil into their gas for their 4 strokes? A couple people I know add premix 100:1. Is there any negative effects of this? Or is it more beneficial with a little extra lubrication for the piston, cylinder, valves, and valve seats? The bikes don't smoke or anything, and be mindful I'm not saying to mix oil like you would on a two smoker.... just approximately 100:1. Any thoughts?