Best oil for 2007 TE250

I just purchase my first Husky and I am having a tough time deciphering the huge service manual. Anyone have any recommendations on what type of oil I should use? Thanks!

20-50 Semi-synthetic. My dealer sells and recommends Spectro "Off Road". He is a Baja race winner, engine builder, and Husky parts developer.

This is always an invite for everyone to voice their own tried and trusted favourites. My guidance is to buy a quality mid priced semi synthetic oil such as a Motul, Maxima, Spectro or Belray and change your oil say every third ride and you filter every second oil change.
That said a lot of members are delighted using Shell Rotella.
I think the message here is change regularly. This is why I suggested mid priced. The really expensive brands such as Motorex are not using their full potential if you adhere to the oil change regime.

I use Elf Moto 4 XT 10-50 in my 07 TE 250.

Change every 10-15 hrs or so.