Just pickup a new 09 Ultra Classic, i ran Sny3 in my 03 and the plug aways came out clean... i have been on other forum and they speck highly of the Sny 3... I just change the oil inthe engine and tranny on the 09 I had some Sny3 left over. the tranny smoothed out, and going into 5th and 6th it almost fell in.
Just proves the old addage that if you look hard enough and long enough, you can find the answer you want. Most of us here suggest that different applications require different lubricants that are fit-for-purpose for the application. Engine oils in engines, gear lube in with the gears of the transmission, and a wet clutch appropriate fluid in the primary. In addition, many of us suggest that a FULL synthetic product be used in the engine and transmission. Full synthetic as in a Group IV product, not a Group III. Here is some discussion from the ford-trucks.com forum:
Group II - Modern Conventional Base Oils
Base oils made by hydrocracking and isomerization technologies had such a signifigant increase in desirable performance over solvent refining technology that in 1993 the API categorized base oils by composition. Solvent refined oils are now referred to as group I base oils. Group II base oils are a vast improvement over group I because they contain lower levels of impurities. Because they are so pure, they have almost no color at all. Improved purity means the base oil and additives can last longer under use. The oil is more inert and forms less oxidation byproducts that can increase viscosity and react with additives.
Group III - Unconventional Base Oils
The API defines the difference between Group II and III base oils only in terms of V.I., viscosity index. Base oils with conventional V.I. (80-119) are Group II and base oils with an "unconventional" V.I. (120+) are Group III. Group III base oils are also called unconventional base oils (UCBO's) or very high V.I. (VHVI) base oils. Group II+ base oils have the same maximum V.I. as Group II (80-119), but have a higher minimum V.I. (110-119).
From a process standpoint, Group III oils are made by the same process as Group II oils, but the V.I. is increased by increasing the temperature of the hydrocracker. The product V.I. can also be increased by increasing the V.I. of the feedstock. Which is done by selecting the appropriate crude.
Group IV - Traditional "Synthetic" Base Oils (PAO)
"The word "synthetic" in the lube industry hase traditionaly been synonymous with PAO, poly-alfa-olefins, which are made from small molocules. The first commercial process for making PAO was pioneered by Gulf Oil in 1951. In the 1960's, Mobil patented an improved process. In the 1970's, Mobil began to market their product as 'Mobil 1'.
Since then, the demand for PAO has grown and some base oil manufactures began using higher V.I. feedstocks to make mineral oils with V.I.'s that matched the PAO's. These new Group III oils were not manufactured from small molecules like traditional synthetics but they bridged the performance gap at a lower cost. Some lubricant manufactures began replacing PAO's with Group III base oils in their "synthetic" engine oils. This created a controversy in the lubricants industry because some believed that PAO's were the only true synthetics.
Some more info from the Self-help pages:
Synthetic Oils - Harley Davidson Community
But the whole issue comes down to this: each member has a bike or more that they are worried about. Each of us has to make our own choices about what to do with respect to fluids. The recommendations here and on other forums are a mixture of factual information and pure fiction. Pick what you want, and what make sense to you. Best of luck with your choices.
TQ