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I've noticed that my '85 190D has a rough time starting in the morning. I follow the owners manual's advice and keep the gas pedal depressed, which helps quite a lot. However, I did not have to do this last year. My preheater lamp goes off normally, so I don't think it's the glow plugs. Since I've changed my oil/oil filter myself (just the latest scheduled change), I think maybe my mech has to adjust something that I did not. Anybody with old diesel experience out there?