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Here's my page about my oil ratio spreadsheet calculator: http://www.dragonfly75.com/moto/oil2.html

To double check I spoke on the phone with Joey Cabrera at Motul and he assured me that I was on the right path by thinking that the principle consideration is the final mixed viscosity. He also assured me that viscosity index and flash point are indicators of the quality of the product which is why I used the oils ratings for those two to come up with comparative oil ratings. He was glad to know (but not surprised) that Motul 800 rated #1 in my comparison.
So now here's my video about the subject:

Here’s some online quotes that are pertinent to this topic:

“It was shown that minimum friction occurs for liner temperatures in the range 140–150 °C, with the higher contribution being due to viscous friction (due to oil viscosity). However, at the higher liner temperature range of 160–170 °C, asperity friction (due to surface roughness) accounts for the main contribution to the total generated friction.
It is clear that an increase in lubricant temperature, governed in the most part by the liner surface temperature reduces the viscous friction.”
http://www.sciencedirect.com/science/ar ... 1022#b0030

“To a large extent, the cylinder wall temperature also determines the lubricant temperature in the contact of the top compression ring”
http://www.sciencedirect.com/science/ar ... 1917301022

“…an air cooled motor, the cylinder walls of which are at a temperature at least 100 degrees higher than that of a water cooled motor…”
Horseless Age: The Automobile Trade Magazine, Volume 32, page 820

“fuel, a large part of which is so non-volatile that it will not vaporize until it contacts with the heated cylinder walls”
Automotive Industries, Volume 20, page 653

-The piston ring and cylinder wall interface is generally the largest contributor to engine friction … which contribute to engine friction to approximately 40–60%
-ethanol is hard to vaporize…due to its high heat of evaporation compared to gasoline
http://pubs.rsc.org/en/content/articleh ... c7ra00357a

Not all oils of the same viscosity are equal from the standpoint of volatility (risk of evaporative loss). Some lubricants may exhibit as much as a 50-percent greater loss from volatility than others. This is influenced by the base oil’s molecular weight distribution.
Of course, temperature plays a key role. A low liner temperature translates to a low evaporation rate. Liner temperature is influenced by load, combustion efficiency and cooling. Approximately 74 percent of vaporization occurs during intake and compression strokes (no speed effects have been found).
http://www.machinerylubrication.com/Rea ... onsume-oil

Thanks for doing all that information. Cool!

That is really interesting info! Thanks for sharing


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here's my video on the subject:

LOL. You sound a good bit younger than I thought you were. I'll watch more later.

I've always been "young". But I think my true age is catching up with me. Yesterday I lost my balance while skateboarding with my son and almost broke my wrist. Man I need to stick to safe sports like dirt-biking!

Yeah. I hear you. I used to be pretty good on a skateboard, could ollie over 2 feet high (White MenCantJump). Now, if I ever get back on one, my best trick is to fear a loose gravel on the road.

Ollies are an impossible dream for me. Best trick I've done is just a wheelie U-turn on an up ramp. That and being 19 years older than the next oldest skateboarder at the park.

Oils to doubt
80 to 120 is the official range given for viscosity index for mineral oils so anything over that is either semi-synthetic or pure synthetic. So by that I know this is a true list of products mislabeled: Bel-Ray H1-R is said to be full synthetic but its VI is only 72. Bel-Ray MC-1 is said to be synthetic but its VI is only 97. Bel-Ray “semi-synthetic” SL-2 sports a whopping 176 VI (which would make it “ultra-synthetic”) but it has viscosities typical of mineral oils. Maxima Super M is said to be semi-synthetic but only has a VI of 120. Maxima Scooter Pro 2T is said to be semi-synthetic but spouts a whopping VI of 185, quite unbelievable. Golden Spectro is supposed to be semi-synthetic but its VI is only 121. Royal Purple HP-2C is said to be fully synthetic but its VI is only 128 (typical synthetics are 135 or more) so in reality it’s a semi-synthetic.