Stretching Generator Oil Change Interval

Yes, We are using all synthetic on NL 12, 20, BMZ 20 (Isuzu 4LE1) and a kluge D1105, 9.
Oil labs are coming back perfect past 300+ hours.

I believe it was the synthetic oil that saved that D1105 when an intake valve stuck open and fuel washed the lung. The 9 is now all together yesterday and running great & strong.
Yep, I under loaded a 9kw. Frack Me (FM).

I queried NL years ago about synthetic. Official statement was dino oil was only approved under warranty.
After that, no comment or concerns.

We are a big believers in synthetic oils. Just wish it was available in CF-2, 40.

It depends, oil should be changed annually. But if you're putting those kind of hours on a trip in a short period of time (a month or two etc,.), I think you can go longer than 200 hours. Best to see how the oil is, color, if it drips off of the stick (seems to have lost viscosity). That being said, I can do an oil change on a generator in 15 minutes, sometimes less on most of them, if I know exactly what tools I need.

I usually run 200-250 hours on the Cummins powered Ohnos or my Isuzu powered Norpro. But indeed once you have everything handy and setup, 30 minutes is all it takes incl racor and sec. No big deal

Shopping for oil and filters is depressing enough.
Dragging a pail of oil on/off the boat.
Disposing of old filters and oil.
Cleaning up.
15 to 30 minutes uh?

During our vacation, we ran our gen-sets over 1000 hours.
The Isuzu received 3 oil changes while deployed, while anchored, in a hot engine room.
On board; fresh pails of oil.
On board; big box of new filters and oil-sorb pads.
On board; empty pails for the used oil and used filter storage.

That is a lot of logistics time and labor.
I know some resources may be easier for Dockmaster in AK, but during and after his time moving south, his logistics will become more painful.

Removing one or two oil changes a year can help keep an old back happy.

In my opinion (IMO), Synthetic oils may offer a lil longer oil change interval but I believe it offers better engine protection. Greater protection when Bo-Bos happen over dino oil.
Here is where I use my common term; More forgiving..

Here is when oil lab reports are a must when extending change schedules and when Bo-Bos happen.
When in doubt, oil labs have better answers.

We're talking about a 5 quart oil change. Not 50 gallons! hehehehee IF the generator has a drain hose or better yet a oil pump connected to it, it can be drained in 2-3 minutes, at the same time you can change the oil filter, adding the new oil takes the longest of all of it. But I can knock out a generator I have done before with good access in 15 minutes pretty easily..............For the oil change itself, if you're on a trip, the only thing I'd be disposing of would be the filter and diapher, the oil can stay in the 5 gallon drain bucket until I get back to home dock and there's room for 3 generator changes. Unless the marina has a place for it. But the only reason I see that many hours is if you're on the hook and running the generator non stop.