Hi all,
Was browsing the net for maintenance intervals for the 159, and came across this website. It goes through step by step procedures on how to carry out maintenance on your Alfa, with detailed steps and photo references.
Not sure if it has been mentioned on the forum before, but thought I'd share it anyway as it seems to be a great resource.
https://www.alfaworkshop.co.uk/alfa_maintenance_guides.shtml
Cheers, Andrew.