I'm not a tight arse ... I use old engine oil
Well I'm proud to be a tightarse. I've not used overpriced Scot Oil since finishing the bottle that came with the kit.Engine oil is fine, lately I've been using it mixed 50:50 with chainsaw oil which clings to the links better.
I've found engine oil too thin and runs too much causing excessive oil to spray everywhere - but the different oil delivery tube lengths affect delivery. Gear oil is cheaper than official scottoil and flows well on my set up, I use the really thick stuff in summer