I think a better indication of 'value' or a car 'bleeding money' is cost per mile. This last year I figured out I was paying about 0.15Cents per mile - seemed resonable for the amount of repairs I needed to do. Repairs happen in spurts too. You could end up going for a long time with no money invested in repairs. Good luck.

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles