Moped Army

Howdy Ya'll!!

So I just scored a super pimp mint condition 1978 Moto Guzzi Robin. Unfortunately non of the fluids have been changed since the early 90's and As far as I know the tranmission fluid is probably orignal. So my question is, what kind of transmission fluid does it take? I heard either 30 weight non detergent or ATF - F. Once I change the fluid I'll be able to ride it. Yesterday was the first day that it ran in almost 20 years so its pretty much like christmas hah

thanks guys!!