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  1. R

    lower unit gear oil question - mercury 40 hp

    can i use automotive type gear oil in my lower unit? What type and weight? thanks
  2. R

    70's model Mercury 402 40 hp questions

    I just got this boat & motor last week and I've never fooled with a motor this old before. Probably some dumb questions here, but would appreciate any help. - What is the black switch on the front left bottom of the motor? It flips back and forth and I can see something moving up and down...
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