Isn't it strange that M1 10W-30 not being mention in MB service? I remember seeing somewhere that oil this weight meet standard driving for 10-86F and above temperature? I'll do some checking. Also, According to howstuffworks site, it looks like the oil type is among the best (see link below).
In your opinion, what'd be the best oil for warm climate (South Florida)? The temperature here rarely goes below 40F.

Thanks,

http://auto.howstuffworks.com/framed.htm?parent=question164.htm&url=http://www.vtr.org/maintain/oil-overview.html