The last 250 2 stroke I ran on the street I used Motul 600 which is now 710.

Put about 3k miles a year for the few years I owned it and never had a problem.

I run Motul 510 in my 250(now 350cc) Honda Fourtrax out in some severe desert conditions and it works well there too.

They also make ester oil if you want to run that.