I just got back from the boat show, and had a long talk with a certified mercruiser mechanic. I have a 4 year old mercruiser alpha 1 gen 2 and wanted to know about routine maint. <br /><br />Bellows: For a trailered boat used in fresh water, they will last between 6 and 10 years. <br /><br />lube splines a couple times a year<br /><br />gimbal bearing every year<br /><br />check engine allignment every two or three years<br /><br />What do you all think? Thanks