I agree. Our '88 300SEL (3.0L I6) had a leak from the EHA valve and I bought one off of ebay for like $20.00 and it worked fine and it has for the last 4 years. The one for your model may be more $ however, not sure how differently those are set up, but IIRC it was super easy to change on ours.

Good luck!

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2004 Toyota Sequoia Limited 4wd
1991 Lincoln Town Car Executive
1991 Cadillac Sedan DeVille
1988 Mercedes 300SEL
1972 Chevrolet Caprice Kingswood Estate 9-passenger wagon
1973 Pontiac Grand Ville
(Prior MB's: 1974 240D, 1985 380SE, 1984 190D, 1993 400SEL)