My Honda 4 stroke brushcutter gets a lot of use, mostly with metal blades in heavy going situations and I would like to keep it forever.

I give the gear head a little squirt of Castrol HTB grease after every tankful while it's hot - just a ml with a medical syringe. Should I be using anything different to lube those bevel gears?

I learnt early on that any excess grease fills up the drive tube and ends up in the clutch so just a little often is my habit.