350 SD
How high are the revs we're talking about? at what speed? My folks have a 350SD and its fantastic on the highway, never noticed anything like that. Are you sure its getting into 4th gear?
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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350
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