Re: hydraulic fluid
SAE 30 is okay in Antigua, not so good in Alaska. Older Prestolite MerCuiser pumps call for SAE 20 or something obscure like that. Yeah, like anybody on the planet carries that! I don't know of any marine-specific fluids except for gearlube and TCW-3. Dexron, Mercon, Power steering fluid, hydraulic jack oil...they all work. If it's really cold where you boat, go synthetic.