I don't believe the 124 was ever a problem diesel, but the 140D was along with any other car with a 3.5 OE 603 engine.

Problem head car's:

W-140 1992/93 300 D
W-140 1994/95 350 SD
W-126 1990/91 350 SDL
W-126 1990 350 SD

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'10 Chrysler T&C Stow-N-Go White. Grandpa's ride.

'13 Chrysler 200 Touring Candy Red. Grandma's ride.

Age and cunning will always over come youth and vigor.