47 years of accumulation, omg the world is ending. Not.
Seems reasonable for the time frame, chromed bores, do eldorados have an oil filter?
And lets not forget the sae SC or there abouts grade of oil that was common back then.
Smart of Guzzi to fit the bike with a centrifugal sludge trap, yeah I know they didnt invent it and its a benefit of the way the crank is made.
How many miles?