190 E 2.6 models are very reliable. The problems they have are valve guides/seals on early models and just the valve seals on the later 1989 and up. This is not a major repair but the car will have excessive oil consumption.
The other problem is the automatic climate control is suseptible to problems. Make sure it works properly on a vehicle that you are purchasing or factor it into the price. These cars will go for 100s of thousands of miles with routine maintenance.
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T