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Wmjinman
I give you lots of credit for wanting to do this Amsoil P I testing. It is a dedicated scientific method you spelled out. I think Metro will be proud. I know he is not an additive fan, but he is a thorough testing evangelist no matter the idea.
I may ask the chem lab guys, who are always doing diesel fuel testing, say about there knowledge of all things additive. These chemists have a wide background from more than just diesel engine manufacturers, so I have to guess they have encountered either tests or research over the years in their line of work for other Detroit OEMs.
Either way for me, the once and a blue moon upper cylinder lubricant / solvent from chevron, Lucas, or other known manufacturer can not hurt, but won't break th bank. I make sure to avoid the 10% ethanol blend just because you get less energy per gallon anyway. So I don't spend much on additives, but I don't expect an MPG increase either.
Your testing will show if more people should try some testing too.
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