On second boat with gear oil well passed the full line on both mains. On one, the oil registers all the way up the dipstick. I’ve brought this to the attention of operators, one of whom used to be a diesel mechanic. Essentially, I’m told there is little to no risk posed here.
My understanding is overfilling engine oil can compromise seals with excess pressure. Is this not the case with gear oil? Or are there dangers posed by overfilling gear oil?