Hey so I found out an interesting tid bit! My mechanic at my Stihl dealer said that there is actually NO high output oiler on the R version? He said its bull cuz if you order a new oiler, the part number is exactly the same on the regular and R versions....
Also, he said that in terms of a tank of gas to a tank of oil....that is just no longer the case with the STIHL saws. He said it used to be about 1:1, but now they are making them differently and it is normal to have a 1/4 tank of oil left at the end of each tank.
I think your mechanic is wrong. There are two oiler part numbers listed for those saws and the R versions get the higher output oiler. This is backed up by my Stihl dealer and my Stihl CD
Send a PM to our resident Stihl guru and actual Stihl dealer "bennn*e" and he'll fill you in with all the facts you need.
EDIT:
Just spoke to Bennn*e and gathered the following intel...
Part number for the HO oiler is 1128 640 3250 and this is listed for the "R" versions.
Part number for the standard oiler is 1128 640 3206 is listed for the 046, 441, 460, and 461 non "R" versions.