Thanks for the response Nate! I will check mine out later on. Heres some specifics.
242,000 miles
almost no oil consumption (1/2 qt in 3,000 miles)
20W-50 oil (Castrol)
80% city driving (bummer, I need to get out more)

I have also been told that if you don't consume oil, you don't have a blowby problem. I was only concerned because when I take off the oil cap running, it's quite a storm. My owners manual gives 20W-50 as a choice for warm climates and my mechanic recommends it for high mileage. It gets changed every 3,000 miles and will get a valve adjustment in 2 weeks. I'll bet 11 seconds on the test!!!

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1982 300D Turbo "Helga"
380,000 miles