Chainsaw technique and oil

[PeterW]

16 hours ago, Home Farm said:

 

I can see that the bars on my saw are replaceable - so can I replace it with a longer bar and chain?

As @Russell griffiths says, longer bar needs more power or will just bog down. It’s always surprising when you see people think you need a 20” bar for an 18” tree .... you can do that with a 12” bar ..! My old top handle Stihl had a 12” on and I took loads of stuff down with it much bigger than that.