I agree that the diagnosis sounds wrong.
Having said that, if you have the original timing chain, tensioner, and guide rails in your '89 420 SEL, I don't think you'll find a person on this site that wouldn't recommend replacing them.
Do a search on 'timing chain' and you can read these threads all day and night.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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