Can anyone tell me about the 8V gearboxes? I'm assuming it's a constant mesh type. Also, are there any copper alloy metals in the gearbox? My 2013 Norge manual specifies a GL-4 gear oil. It's my understanding that GL-4 was intended for transmissions that contain bronze synchros or bushings. It's also my understanding that modern GL-5 oils (those of the last 15 years) use a buffered sulfur that is not corrosive to copper alloys.
I'm just curious as to why Moto Guzzi specs a GL-4.
Thanks