Kinda hard to do on a cold engine, as they will drain eventually no matter what kind of oil is in there.

Basic test is to depress when unloaded (not depressed by the cam lobe) -- if you can push it down with a stick or screwdriver by hand, it's bad. However, if the oil is drained out, it will test bad even though it works fine.

Peter

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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!