Thank you Vito and Bill.
We postponed our departure by one day to get the oil and missed half our sailing window! For anyone else who may have a watermaker with a CAT high pressure pump, what you need is:
CAT Pumps Crankcase Oil ISO 68, petroleum based, hydraulic oil.
21 oz. (0.62 liter) $12.95 at Watermakers Inc. of Ft. Lauderdale
Funnily enough, the Amel manual on board wants 0.75 liter oil changes on this pump!
Or, per e-mail received from the CAT factory yesterday:
"We do have our own Cat oil that can be found at Northern Tool and Home Depot.
But if not available to you.
It is a non detergent 30W Hydraulic oil, or a ISO 68"
And then we desalinated over 300 liters today. This thing is fast.
At anchor, Lake Worth, La Florida.