I hope someone else can give more legal bits about this. I can't give any web addresses, not in English anyway, sorry. I'll google a bit more later, as I find it fun and interesting.
Mineral chain oils are still on sale in Sweden, but are becoming more and more replaced by vegetable oil. I don't work professionally with chainsaws, so I can't say with 100% certainty, but labour unions and communes, cities, forest companies, demand that machines/saws use vegetable oil when possible. If you can't guarantee vegetable oil you won't get the contract.
According to a report in magazine Skogen ('Forest') a couple of months ago, 90% of the oil used in forest industry in Sweden is vegetable based. (bar lube oil and hydraulic oil for machines, harvesters as well)
The vegetable oil is according to the article better at lubrication, and also sticks to the blade better, than the old oils.
The report also says that 2ml oil per minute is enough to lubricate. 1ml is too little, 6ml too much. I have no clue how to measure that though
The oils mentioned in the article are canola and pine, not pure oil but mixed and with additives I guess.
(
http://www.tidningenskogen.com/artiklar/2005/1005_art_3.shtml)
I can't imagine why 10% still don't use vegetable based oil, but my guess is that those are mostly farmers (and amateurs, like me), not professionals. And price could be an issue, I don't know.
Updated : I found some info from Swedish Parliament 2001, it said that a law banning mineral oils (for chain lubrication) was unecessary as nearly all industry already used vegetable oil. The environmental laws also says it's not allowed to use polluting products in forests when there are realistic alternative solutions, and there are (vegetable oils). So, even though the law doesn't say that mineral oil is banned, it does say you should use bio-degradable and non-polluting oil. And that means vegetable based.
For reference, ignore this if you don't read swedish
MJ 437 : 2001 : "Utskottet konstaterar för sin del att följande skall beaktas enligt miljöbalken för att motverka skador på människa och miljö vid drift av maskiner i skogen. Verksamhetsutövaren skall vidta det mått av försiktighet samt undvika känsliga områden i den utsträckning det behövs för att förhindra eller motverka skador på människor och miljö. Verksamhetsutövaren skall använda de driv-, smörj- och kylmedel, köldmedier, hydraulvätskor och andra kemiska produkter som medför den minsta risken för skada på miljön (produktvalsprincipen). Nu redovisade krav skall beaktas i den mån det inte kan anses orimligt." (just quoted a part of it)
(Also, as I googled again, at the top of googles result-list _THIS_ thread turned up )
Google is QUICK sometimes.