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The return lines can be purchased at a Mercedes dealer and some other auto shops will have standard 1/8 rubber hose. Make sure it is compatible with diesel fuel (not vacuum hose). You might also consider spending the extra money and get Viton hose from a place such as Fryerpower. That way, if you ever happen to use biodiesel, you won't have to worry about the lines being damaged.
Cleaning the top of the valve cover is just a slow, messy chore. Wear rubber gloves, use disposable rags or paper towels. Almost any solvent will work, anything from biodiesel to WD-40. Depending on the flammability and toxicity of the solvent, you might wish to do the work in the open air. (Another advantage of biodiesel is that it is minimally flammable/toxic.)
If you replace the return hoses and the CCV pipe forest (the hard plastic lines are usually OK; the rubber elbows and tees tend to harden with age) then you will have no more leaks and the valve cover will stay clean.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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