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Originally posted by Peter E:
My transmission dipstick doesn't have any marks except for a groove about 3/16" from the bottom. The oil level is about half way up the dipstick. What is the correct level?

Not knowing if all 2GM transmission dip sticks are created equal with markings... I recommend you drain the transmission case, then refill it with .25 liter of SAE 10W-30 oil as specified in the Yanmar Manual. See where the oil level is on the dipstick once everything settles and that's where it is supposed to be!