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  1. W

    Help. Transmission oil? 1987 Merc 7.4L GM-454 V-8 ?

    I don’t know the transmission, but it’s pushing a Carver 38’ Santego 3867.
  2. W

    Help. Transmission oil? 1987 Merc 7.4L GM-454 V-8 ?

    Inboard. Oil hasn’t been changed for the 7 years I’ve owned the boat. And the oil wasn’t black but a rich brown. (And not red). Not sure if the transmission. But connects to a Walter V-drive if that’s a clue.
  3. W

    Help. Transmission oil? 1987 Merc 7.4L GM-454 V-8 ?

    Hey guys.i don’t have the Merc owners manual and i had to replace the oil to my transmissions and Im getting conflicting recommendations for what to use. It’s 1987 - engine serial numbers B793144 and B793005. I’m stuck at the dock and don’t want to do this twice by using the wrong one. Should...
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