WHAT TO LOOK FOR IN A QUALITY 2 CYCLE LUBRICANT

Snowmobile Magazine - September 1988
Here is what To Look for in a Quality 2 cycle Lubricant: 
1. BASE:  A petroleum base with a low ash content, a quality synthetic base, or a petroleum synthetic blend that combines each of the previous characteristics, is the main ingredient in any lubricant.In addition to causing carbon build-up, a petroleum base oil with a high ash content can reduce fuel/oil ratios and cause a lean condition.
2. RUST INHIBITORS:  Additives that prevent moisture from condensing on internal engine components are essential to a snowmobile engine.
3. DETERGENTS: Just like the motor oil used in your automobile, snowmobile lubes should include some type of detergents that clean your engine as they protect.
4. POURING POINT: As a general rule, 2-stroke oils aren't rated by weight.  They do, however, have a pouring point which indicates the lowest temperature in degrees Fahrenheit at which the oil will continue to pour and perform to its full potential. When choosing an oil, make sure that the pouring point coincides with the climate you'll be riding.
GAS MIXING RATIOS FOR 1 GALLON OF FUEL:
20:1 Ratio = 6.4 oz oil, 24:1 Ratio = 5.3 oz oil, 32:1 Ratio = 4.0 oz oil, 40:1 Ratio = 3.2 oz oil,            50:1 = 2.6 oz oil, 80:1 = 1.6 oz oil