Most 2 stroke oils dont really seperat. It is just the Caster Oil in both 927 and Benol. When it gets cold out its like oil and water, they dont mix. Well maybe not that extream but along the lines of that.
Here is a link to Klotz's web page. They only give a waring about Benol. No warning about there other oils.
Benol Link
http://www.klotzlube.com/tech/BC-175-1.pdf
Supertechniplate link
http://www.klotzlube.com/tech/KL-100.pdf
R50 Link
http://www.klotzlube.com/tech/KL-102.pdf
I run the Supertechinplate because it is the best of both worlds. Super Strong Film strenth because of the caster oil, and Clean burnig because of the Synthetic oil.
I think Supertechhiplate is pretty much 20% Benol Caster oil, and 80% of there R50 Synthetic oil.