On May 21, 11:40 am, Wayne.B wrote:

That's *not* going to happen with a 3600 RPM air cooled diesel. I'll be surprised if it makes 1500 hours at half load, even if you change the oil every day.

I thought contemporary wisdom was that frequent, such as daily, oil
changes were a BAD thing with modern lubricating oils?

Modern oils with zinc and phosphorus additives require a certain
minimum amount of operating engine time to reach the lability point of
the organometal additives. The chelated zinc and phosophorus additives
are designed to be labile, so the ligand molecule will surrender its
metal load into a micro-void on the surface of a stressed engine part
(eg a bearing surface) when the ligand molecule has been stressed by a
heat/pressure event. The surrendered zinc, phosphorus or whatever
additive, by its deformation (because it's softer than the steel
bearing surface), is what protects the bearing surface.

Changing the oil too frequently prevents the additives doing what they
were designed to do. Of course, changing the oil frequently boosts oil
corporation profits. And if you're holding stock in Big Oil, that's
not a bad thing either.