Never drive it unless you drive it long enough to get up to full engine operating temp, even if that means you must drive the long way around or leave the engine running while you do something. Otherwise, you will get water accumulating in the crankcase, and that will ruin the engine. Not pretty.

If you do ONY short distance driving (5 miles or less), change the oil every three months, whatever you use, to keep the water content down.

A weekly trip of 20-50 miles will do wonders for keeping the car running well and the oil free on condesation.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!