I have always used stihl bars untill now. I have a sugi 25inch bar with a grease port on the sprocket tip i have some automotive grease here. Is their a certain grease you need to use for your sprockets.
The consensus is that if You start greasing Your bars sprocket then You must keep doing it.
Reason is the grease creates a barrier that the B&C oil can not get past.
Generally the bars sprocket gets lubricated by the B&C oil and greasing is not necessary!
Not sure I am allowed to link this- Admin can delete if not.
http://www.madsens1.com/bnc_noses.htm
It is a personal choice thing, if the hole is there and you choose to use it, so be it- you own it and it is yours to do as you deem fit to do with.
What the above link will do is show you there are plenty of other ways to ruin a bar nose tip before debating grease- or no grease.
One advantage (if it can be called that) is an old bar that has been allowed to sit and the bearing has become somewhat locked up with old dry grease or possibly rust. It is possible to sit that bar tip in diesel for a while, get it moving a bit and if there is a grease application hole available, you can use fresh grease through that port to push out a whole heap of debris and maybe get some more life out of that old tip sprocket and bearing- not ideal, I agree- but it can be done.
Automotive grease is fine. No doubt someone will find exception with that and give sound reasons why one grease should be used and why another shouldn't, but in my own experience- it is the first grease found that is loaded into the small gun I use for clutch needle bearings and bar nose tips and I am yet to find either fail that I can blame on the choice of lubrication.