I'm working on my '87 Baja with an OMC Cobra sterndrive (my first boat). I pulled the u-joint shaft to replace the u-joints and will also be replacing the water pump assembly. Anyway, my (stupid) question is, where can I get fluid for the drive? Also, what kind of grease can I substitute for the "OMC Triple-guard grease"? Is this stuff available at Wal-Mart or an automotive store?