I won't specifically say that the Jonsey Turbo oil has anything wrong with it, but dealers in my region have been selling the same stuff for 7 or 8 years...I think Tilton (Jonsered importer) made a deal for tons of the stuff and is still trying to get out from under it. It does not carry the ISO "L-EGD" or "JASO FC" label, so the quality is unknown. Jonsered honors the warranty if the product is used, so it can't be really bad, but since nobody knows...?
I asked my old Jonsey dealer if he knew the rating for the oil, and he did not. He promised to ask the Tilton agent, but got no response there. I believe the oil to be a Tilton-contracted product, with no relationship to any Husky product; but again, if Tilton agrees to honor the warranty if a saw or trimmer fails, it's probably OK.
My old Jonsered dealer has retired, and closed. There is a new store selling them near me that doesn't stock the oil anymore, because Tilton doesn't publish the specs for the product. While Tilton may honor warranty issues with it's use, other makers will not, unless the owner can produce an oil bottle with the label I mentioned above. For this shop it's just insurance...if by some chance a customer blows up his EFCO trimmer or Echo blower using the non-labelled Jonsey oil, they may not get paid for warranty repairs.
Here's a <a href= "http://www.goa-northcoastoil.com/tips/2cycleol.html"> link to a discussion</a> on 2 cycle oils that may clear a few things up for folks new to the subject. For those who've seen it before, surf around the site to find results of testing their snowmobile products.