bought a boat that stood about 6 years. the incline or trimmer has not been used for a long time. When I brought the boat home and started working on it and driving it, the pitch and trim worked, but it sounded like it was struggling a bit with the job. The pump made strange noises. drained and replaced with this fluid and after moving the T&T up and down a few times the noise sounds normal and at normal speed and the problem is resolved. worked great for me!