Re: lower unit oil
You're correct, the gear housing lubricant capacity is approximately 11.5 fl. oz. (340 ml). Are you sure you let it drain out completely prior to re-filling? You might try rotating the prop shaft, and tapping gently on the gearcase with a -soft- mallet to pursuade any entrapped air out the vent.
Is the gearcase sitting truly vertical? I'd let it rest for a while, and see if the air works its way out, allowing more lubricant to be added.
Seems odd you can only get 65% of the lubricant in there, unless it has an air pocket or was not completely empty, or was filled to quickly creating a lot of small bubbles in the lubricant.
If it is really cold where you are, the oil viscosity may be making it difficult to vent.... fill it -slowly- from the bottom.
Good luck.
