In Reply to: Re: DEUTZ v8 oil consumption posted by NDDan on February 08, 2010 at 20:09:02:

An air cooled diesel cylinder has to handle a temperature range from -40 F to 600 F while a water cooled one from -40 F to 212 F. That's why the piston and ring clearances are a little looser on an air cooled (to handle the temp range) and why they use a little more oil than a water cooled. This is also why the emmissons regulations killed the air-cooled diesel.