I have the same problem with our Perkins
4-154. I end up adding a quart now and then - probably after 100 hours or so - and yes, while it makes a mess in the bilge
under the engine, getting under the engine to replace the gaskets would be a huge and extremelydifficult job. I just make sure that EVERY TIME I start the engine - whether it be since last week, or the day before, that I check the levels of oil, coolant
and trans fluid.
I have also been told by more than one Perkins' owner, that this is the nature of those engines. They simply leak. They are workhorses, and as long as you keep them filled, they perform. I would keep my eye on it to make sure it doesn't become more serious, but not worry too much. Good luck. gchabs