Last coolant replacement: June 9, 2006. 269549 miles.

Last top off: addition of about 450 ml. October 8, 2006. 274936 miles.

Do I have slower air bleed due to slower engine speed (diesel)?

No white smoke.

__________________
1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.