On Sun, 30 Sep 2012 00:47:29 -0700 (PDT), harry wrote:

So you don't have to lube the bearings on a windmill?

So how often do you change the oil in your car gearbox?

The gearboxes and differentials get their oil changed every other service
ie 24,000 miles. The engine is every service 12,000 miles.

How ever a number of engines these days share the engine oil with the
gearbox. So that will get changed every service...

--
Cheers
Dave.