trade in or spend more money?
 

I have a 1997 E350 v 10 with 195,000 miles that runs fine but is getting old.
I bought it with 160,000 miles and have changed all brakes, rotors, wheel bearings, and alternator.
Mechanic says I should have the ball joints changed soon.
If I can keep it going for $1000 (maybe a bit more) a year, I would love to keep it.
I really don't want to buy another van.
Should I keep putting money into this beast or save it for a new one?