Yes, three different engines.

1986-1987 3.0L OM603.96x, known for it's risk of cracking the head.
1990-1995 3.5L OM603.97x, known for randomly bending connecting rods and extreme oil consumption afterwards.
1990-1995 3.5L OM603.97x, rebuilt/replacement by Mercedes, far less likely to have rod issues.