What type of Gear box oil for cream separator?

I posted this in the cheese and dairy category and have not had much response.

I post it again here hoping to have it answered.

I just purchased a cream separator off of ebay. I have been unable to find out what type of oil to fill the gearbox with. The owners manual (50 years old) says to use "DeLaval Cream Separator oil" Well there is none of that to be found.

What do I use in its place?

Thanks

 

I have a DeLaval manual (crank) separator. It is not electric powered. Does this matter?

 

Thanks so much Sondra!