Hi Grumpy, Thanks for the reply and info. I haven't had a lot of experience with chainsaws yet. I do use a proper chain bar oil. Will probably get a 12v sharpener and plug it into the ciggy lighter, have a ute which the tray makes a handy work bench. The saw I have is a Stihl Farmboss 310. Your info is much appreciated. Cheers, LS