Dar, I don't understand your response. It seems Klotz thinks there oil is pretty good otherwise they wouldn't be selling such oil? Film strength is a little lower but there are no ASTM tests to qualify a two stroke oil in this regard. If KL-200 is not good then one would assume that all model engines should be just fine with [link=http://www.klotzlube.com/tech/KL-102.pdf]Klotz R50[/link] but nobody uses it. Ran it in some four stoke diesels because it blended with kerosene and provided the properties I was looking for. Oops, R50 is not suitable for methanol.

http://www.aerosynth.de/pages/pdfs/ASynthEng.pdf

http://www.aerosynth.de/pages/pdfs/ASaveEngl.pdf

This data sheet says nothing about the characteristics of the oil, whatsoever. edited to add the following: I did find a viscosity plot of the AeroSynth 3. It is very interesting that AeroSynth has higher viscosity than castor oil above 100°C. now if only this oil was easy to get in the US.

Compare to this data sheet for another one of their oils.

http://www.aerosynth.de/pages/pdfs/Comp2Plus_Engl.pdf

Now, I know these oils are spoken of highly, but how does one gather than KL-200 is inferior from a data sheet.

Dar, if you have experience with both oils and think that one is truly better I'd like to hear about it. The more I look, the more oils I find, many of which are very hard to find in the US. Klotz is well known, as are the standard Shell, Castrol, Valvoline, Amsoil, Penzoil, Redline, but few are suitable for methanol. Some of the major brand products are not available is certain parts of the world. Recently I found Motul Micro(no data sheet available, but for model engines specifically), ELF, and a couple others. Some companies don't even publish specs and are averse to sharing them. Blendzall was not interested in sharing specs on the various castor oils they sold.