I've been reading a bunch of the old posts on this subject, and tcw3. Sorry if I'm kicking a dead horse. But Rotax has changed thier position on this and is now recommending "high quality ashless API-TC" as a suitable substitute for theor own oils. I've checked the operaters manuals for both the aircooled snowmobiles and the watercooled high compression high rpm 440 race sled that uses premix. This represents quite a range of engines IMO. This suprised me as I know for years they insisted on low ash. One guess for the change would be the quality of the ashless dispersants are better? Another guess would be the ring design that is now being used on most their models. For years they used a L ring, dykes style that would be more prone to "sticking". Most the new engines use a flat or semitrapeze style ring. The motion of the newer ring style tend to be somewhat self cleaning. They do still forbid the use of outboard oil and tcw3. That subject can get confusing, because there are oils that are both isoegd+ AND tcw3 AND use a ashless dispersant. For example http://www.klotzlube.com/support/techsheets/KL-302.pdf
In the rotax aircraft engines penzoil aircooled has been a big favorite, low ash. But penzoils tcw3, api-tc rated "multi purpose" ashless oil has been tested and documented as being approved for use. It's well documented in the airwolf files if anyone wants to search it out. They compared a few synthetics also.
Long story but I was once forced to run plain ole 4 stroke motor oil in a autolube system and was suprised that "nothin happened". Realize the twostroke stuff that had been in there was kinda crappy by todays standard. Since then I have experiemnted in my oil injected sleds using some motor oils that have simular viscosity properties to the dilluted injector oils (aprox 20w,>-40 pour). The results have been interesting and positive for the most part. Has anyone else done this, or have any comments good or bad about it? It's not that I don't trust the injector oils out there, I just wanted to experiment with higher flash point oils that are hard to find in the twostroke oils.
In the rotax aircraft engines penzoil aircooled has been a big favorite, low ash. But penzoils tcw3, api-tc rated "multi purpose" ashless oil has been tested and documented as being approved for use. It's well documented in the airwolf files if anyone wants to search it out. They compared a few synthetics also.
Long story but I was once forced to run plain ole 4 stroke motor oil in a autolube system and was suprised that "nothin happened". Realize the twostroke stuff that had been in there was kinda crappy by todays standard. Since then I have experiemnted in my oil injected sleds using some motor oils that have simular viscosity properties to the dilluted injector oils (aprox 20w,>-40 pour). The results have been interesting and positive for the most part. Has anyone else done this, or have any comments good or bad about it? It's not that I don't trust the injector oils out there, I just wanted to experiment with higher flash point oils that are hard to find in the twostroke oils.