I have a pair of merc 60 4 stroke (EFI) on a houseboat and a hefty price to pull it out of the water. My last lower unit oil change was when the dealer winterized them in fall of 2018. I didn't make it in the water last season so no hours on this oil change.
1) Is lower unit oil the same as the engine oil where changing every 12 months (regardless of usage) is 'required'?
2) If so, is it possible to do 'in-water'? ( I have jack plates and with a full tilt I have access to the ports.)
3) I'm a slow boat and proud of it. Does the fact that I almost never run the RPMs higher than 5k have any effect of the need to change oil in the above case?
Thanks!
1) Is lower unit oil the same as the engine oil where changing every 12 months (regardless of usage) is 'required'?
2) If so, is it possible to do 'in-water'? ( I have jack plates and with a full tilt I have access to the ports.)
3) I'm a slow boat and proud of it. Does the fact that I almost never run the RPMs higher than 5k have any effect of the need to change oil in the above case?
Thanks!