The issue of serviceability is one reason I actually have a preference for the 2.3 M102 (4 cyl) in my 190E. Whilst I love the sweet, smooth and revvy M103 (6 cyl) like in our 300TE and would have liked the extra performance of the 2.6 in the 190E, I do not like the way it is shoe-horned in there. The W201 also gives sharper handling with the lighter four. Indeed, the W124 is also claimed to handle better with the four but the extra power and smoothness is nice in the larger car.
107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.