hi Richard, yes I use the Halford classic 20/50 or Morris golden never had any problems. Change it every 1000 miles.
First Wednesday in the month we (guzzi club) meet up at the crown and thistle at Kidsgrove.
Regards Andy
Ar I came along to a meet-up at that Inn, maybe last year or the year before on my little Guzzi 750T, which I've since sold. Also on my Mirage years before, to The BlueBell. My Laverda has been pretty much laid up for a few years, since then, but I'm in the process of getting it all up and running, hence the oil question. Sounds like I'll be fine with any half decent 20W50 oil, providing It gets dumped regularly. If I can get the bike all running, with new fluids, I'll join you down at the Crown & T, although, my next issue is sticking clutch plates, possibly from standing not used for a while.
Regards Richard