Its working! after mixing 2 oz auto-rx with a quart of 30w motor oil, and replacing the fluid in the hydraulic trim rams about 3 weeks ago. I checked the pump reservoir, no sign of water contamination! (easy to spot because the oil gets milky-looking) and, have kept the boat in the water longer than usual-4th of july fireworks show spent the night, usually take it out every weekend. Ran the rams up and down several times in between. These things are 21 years old, little o-rings keep the water out. They cost about $300 each(!) to replace and about $150 to repair, what a relief!!