Thanks for your comments. I've heard a lot of stories about people doing almost no oil changes at all. I've also heard a heck of a lot about oil analysis- but where can I get that done? Do I send them a test tube of oil, or what? How much does it cost?

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1984 300D Turbo Diesel - 211700+ mileage (now sold)
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In any of my posts, it is safe to assume
that I'm talking about this car.