We have a 3GM30F in our boat. I'm not familiar with a "3GMD" variant. What does the "D" signify?
But I do know about that discrepancy. The manuals contradict themselves. I was told by a mechanic that I trust to use straight 30W motor oil in our Kanzaki transmission. We check the level with the dipstick unscrewed.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT