Rotella is fine in anything with Vortec heads. In the older flat tappet Fords (all Fords) and Chevys, find an oil with appropriate levels of ZDDP such as, but not limited to, Valvoline VR-1 20W50.
Previous: 1993 Prostar 205
Red 1998 Closed Bow Ski Boat, PCM GT40, 310 hp, Standard Gear Reduction, Acme 4 blade, Perfect Pass SG/Zbox.
Tyler Ski Club
Be kind. Have fun.