They can try Metric Motors. They are a well-known re-builder of Mercedes engines.

Here is a link to the page that shows the engines they sell and the cost:

http://www.mercedesengines.net/300s.htm

The warranty for that year engine is 4 years or 50,000 miles.

__________________
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".