Dear Jim_Golding,
Citgo Sea & Snow MSDS Sheets here:
http://www.docs.citgo.com/msds_pi/621612001.pdf
Citgo Supergard Sea & Snow Synthetic-Blend 2-stroke oil Product Information Sheets here:
http://www.docs.citgo.com/msds_pi/10008.pdf
Citgo also makes Mystik brand oils.
Mystik JT-4 Product Information Sheets here:
http://docs.mystiklubes.com/msds_pi/M20075.pdf
Mystik JT-4 Synthetic 0W-40 MSDS Sheets here:
http://docs.mystiklubes.com/msds_pi/663081002.pdf
Amsoil Interceptor Synthetic 2-cycle oil Product Information Sheet here:
http://www.amsoil.com/storefront/ait.aspx
Amsoil Interceptor MSDS Sheets here:
http://www.amsoil.com/msds/ait.pdf
By the way, if you want a 100% TRUE apples to apples, synthetic base stock to synthetic base stock oil comparision, COMPARE the Mystik JT-4 to Amsoil Interceptor. They would be considered near "equals", and I do admit, the Interceptor does appear to be a better oil.
But again, back to price. Note that there is a mere $2.00/gallon difference between the Mystik and Amsoil synthetic (assuming that you are an Amsoil "preferred customer", and have paid the yearly membership "fee".) Otherwise there is a much more substancial $11.41 difference per gallon. (UGH.)
Mystik JT-4 Synthetic = $24.99/gallon
Amsoil Interceptor Synthetic = $26.99/gallon (plus $20/year preferred fee already pre-paid), otherwise it's $36.40/gallon
Keep in mind, the Citgo S&S is a synthetic-blend, and costs $11.79/gallon.
As for any direct physical comparison analysis, no I do not have access to any of that.
More statistical data information you may want is available via the various websites, similar to what the links above will provide. Additional data or testing may be acquired by writing the various companies and inquiring, however due to proprietary information, you may not be able to acquire certain data that you may be seeking.
Look, despite the "numbers", the primary reason (in simplest form) that I'm a firm believer on running the Citgo S&S is because it performs just as well in 2-stroke snowmobiles in the real world, as the "premium synthetics" out there do, but for a fraction of the cost.
Anyone who has run it, knows it to be a truth.
The fact is, we aren't running tens of thousands, hundreds of thousands or multi-million dollar machines here. Is Amsoil (Interceptor for example) a better oil than S & S? Well, in some ways, yes, and take note that I have never disputed that arguement.
However, what people need to realize and accept is that we are talking about snowmobiles. Powersports toys, that on average, have a life expectancy similar to an automobile. The facts are that the majority of snowmobiles are "disposed of" or at minimum, "retired from regular use" within a 10 years timeframe, and 10,000 miles on average. Granted, in some areas of the snow belt they see many more miles, but in other areas, it's not uncommon to find sleds with far, far fewer miles logged on them.
We all want to enjoy our snowmobiles for as long as we can. We want them to run as reliably as possible, and we want to fuel them as cheaply as we can. Until the day comes, when we've decided that we are "sick of them" and we want something "new & improved". After all, it's the American way!
Therefore, sometimes "the best practical oil to do the job" may not actually be "the very best scientific oil".
I've said it before, and I'll say it again... Sea & Snow - they way to go, for average Joe!