Who is to say, and this is my opinion, that the 2 or so HP changes aren't just dynomometer variances from run to run and/or changes in the motor output from say a cool down or something.
I think it's unfortunate when a very well respected, and independent, expert takes on a vested interest from any kind of company that is in the persons field of expertise. To me it's like they are selling out somewhat and are being bought. Especially if they then write any kind of review or report on said product. It degrades their integrity somewhat but an oil additive is a rather small part of what Vizard is an expert of so little harm there I think.
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