That's so awesome. Did not know that
Ya' learn something new every day.
Anywho, my 9000 mile spree has been sucking down Royal Purple full synthetic TCWIII for three years and 4500 miles, and unless the rings were replaced before i got it, they are origional. my jug still has beautiful cross-hatching.
Methinks the wrist pin needle bearings are getting a tad sloppy, resulting in my beloved "death rattle" the engine makes. i'll blame the oil for that.
reasearch
http://www.7thgear.net/7thGear/Portals/ ... 0specs.pdf
or for those w/o adobe, a paraphasing;
"NMMA TC-W3 ÔÇô two cycle water-cooled, third generation. TC-W3 obsoletes TC-W & TC-WII. Oils with this spec do not use metal based additives, and are ashless. This is an outboard specific spec.
API TC ÔÇô only API spec established for two cycle engines. It regulates lubricity, detergency, ash content & pre-ignition. Oils with this spec are typically using metal based, ash producing additives.
JASO FA ÔÇô original spec established regulating lubricity, detergency, initial torque, exhaust smoke and exhaust system blocking.
JASO FB ÔÇô increased lubricity, detergency, exhaust smoke and exhaust system blocking requirements over FA.
JASO FC ÔÇô lubricity and initial torque requirements same as FB, however far higher detergency, exhaust smoke and exhaust system blocking requirements over FB.
JASO FD - same as FC with far higher detergency requirement.
ISO-L-EGB ÔÇô same tests and requirements as JASO FB.
ISO-L-EGC ÔÇô same tests and slightly higher detergency requirements (piston varnish) as JASO FC.
ISO-L-EGD ÔÇô same tests and requirements as JASO FD.
ÔÇó National Marine Manufacturers Association (NMMA) is based in the USA.
ÔÇó American Petroleum Institute (API) is based in the USA.
ÔÇó Japanese Automobile Standards Organization (JASO) is based in Japan.
ÔÇó International Standards Organization (ISO) is based in Europe."
Too bad that the API never gave any further ratings requirements for the U.S.
i bet gn2 is a JASO FD oil...
Quoth wise pdf file;"Most OEM 2 stroke oils fall in either the JASO FB/ISO-L-EGB (Good) or JASO FC/ISO-L-EGC/API TC (Better) category, although the container and the owners manual will never actually list an oil spec. OEMÔÇÖs prefer just to recommend their private label product and tell you there is no known equivalent. It is easy not to have a ÔÇ£knownÔÇØ equivalent if you do not look for one."
i also bet that Royal Purple exeeds the minumum requirement of the NMMA.and most of the other ratings.
though i cannot find which rating GN2 conforms to, the website selling it sayeth;
"Pro-HondaÔäó GN2 is the only oil that has been tested and approved by Honda R&D for use in all liquid- and air-cooled 2-stroke Honda motorcycles, scooters and ATVs, including the PilotÔäó and Odyssey.Ôäó Its unique clean-burning formula reduces exhaust smoke, carbon buildup and varnish deposits, and helps prevent spark-plug fouling, ring sticking and exhaust plugging. GN2's superior lubrication extends service life for piston rings and bearings, and helps protect against rust and corrosion."
Spiffy trick they got there, using the same oil for liquid and air cooled applications both. Honda-san bows before no rules or principals.
ROYAL PURPLE TCWIII 
