All the necessary parts manuals, diagrams, and operator manual etc are on the jacobsen website in pdf format. Very helpful and a wealth of information.
I have a 445G and went with ISO 68 hydraulic oil. Its listed as an approved alternate oil, along with Sunoco EP special 20w20 and Mobil Delvac 20w20. I purposely chose the ISO 68 because its universal and should be easy to find. Most hydraulic hose shops would be your best bet. I tried small engine places, lawn mower shops, etc (except Jacobsen wasn't a local dealer) and they ended up all having their own proprietary hydraulic oils .... so no good there.
Find ISO 68! Its a 20weight hydraulic oil and is what the service manual called for in the 445G.
Hope that helps.
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