Just saw this on books4 cars:
68-86 4 cyl gas engine service manual by Mercedes for 220 & 230 & G-Wagen ( 115 ) as in such models as 230E 230TE 220 and more
Sounds like the one to me!
'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.
"A Mercedes-Benz is like a fine wine, it only gets better with age."