Plug in chargers (wet mount) can’t be used on a cruiser that has 12v load while sitting at the dock (Like a fridge). Almost all wet mount chargers time out if the battery does not reach full charge after 15 hrs or so and won’t start charging again until power is reset. Your hardwired charger...
I know this market is still crazy, but those both sound high, regardless of condition. As mentioned, those are both ripe to have transom and stringer issues, so check closely. In my area a new interior will run $6-8k.
I did a similar evaluation years ago, so the formulations have changed. The Merc branded oils all sheared to a 30 or 20 wt but the wear metals were still ok. Rotella 15w40 held grade and the wear metals were good, even a touch better but it was only 1 analysis. Valvoline 15w40 held grade and...
Friend has the Volvo version. Likes it, does ok for a casual wake, and is better than a fixed prop for regular cruising. Loading on a trailer and his lift both required new skills and cautions because of the increase draft.