if the battery is getting low your engine should try to turn over but sound kind of pathetic doing it. A slower version of a start. If your headlights and electrical components like stereo still work then battery might not be the cause. Do you have a multimeter? Check the batts potential, maybe you do just need a jump start, happens to everyone. Jump on a good battery shouldn't leave you stranded. If it does turn out that you just need a jump you might consider checking for a battery drain with the car off. Lastly, just wipe the tranny dipstick off with a clean rag.
1985 190e 2.3