I'm running an '04 150 hp Yamaha carburated V-Max outboard. It's out of warranty. The dealer says I have to use Yamalube oil in it. Yamalube is a synthetic blend that conforms to TC-W3 standards. My question is, can I safely use another brand of premium synthetic blend oil in it? I think every oil I've looked at conforms to the TC-W3 standards. Thanks!