Keep it simple. Run Delvac, Delo or Rotella 15w40 in it. if you want, use their semi synthetic blend versions but not even necessary. These 3 are available everywhere and inexpensive.
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...
