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My note about cylinder oil:

Cylinder oils are the most viscous lubricating oils that are available. Due to the very high toughness, the gear shaft brakes quickly when the clutch released.

But you have to know that these oils have no additives!

Regarding wear protection, it does not matter, since the gearbox hase only a small load.

However, it is not a good thing that there is no corrosion protection. Condensation will form in the transmission over the time.

Therefore, the cylinder oil should be mixed with additized 680 gear oil. It also makes sense to change this oil every 2 to 3 years.

I drive 1500 cylinder oil + 680 gear oil (AISE / US-Steel 224 [= Deutsch T3 CLP]) in the ratio 2: 1.