my cars getting some work done so i borrowed my mates 90ish model petrol ford econovan with 250,000km just to get to work and back. he paid $250 for it with rego so you can get a rough idea of the condition. its his extra car that he never uses and its a total piece of cr@p but it runs ok(ish) and idles ok(ish) and sits on 110 ok(ish).
it also leaks oil, alot. everywhere you park it leaves a patch the size of a CD(ish) depending how long you stop for of course. he told me "when you get home, pour in half of this oil... i havnt filled her in a while"
so i do as he says and get home pour the oil in and it runs for about a week. hardly idles without the choke on a little, it terribly hesitant and gutless at low revs and backfires once or twice. also likes to stall randomly at traffic lights. needless to say im looking forward to getting out of this piece of cr@p and getting back into my own car.
on the way to work this morning after almost warming up, judging by the dodge temp gauge, it starts to die at 100km. no power at all, so i drop to 4th and try there... still no power. put the clutch in, its idling as good as it ever did and revs smoothly. it keeps slowing down until i come to a complete stop.... but its so gutless i cant even take off in 1st. then it just stalls and coughs a little. try to start her up again, starter wont turn over... can hear the solenoid click but no go.
so now im late for work but luckily pretty close so i walk the rest and figure ill deal with it later. head back after work and check the coolant figuring i may have blew the head gasket. coolant is plentiful and nice and green, no oil in there either.

so how much damage has this done?
could this be the cause of the problem? (stupid question, probably is)
will draining the oil back to a normal level be fine or should i check something else?
the only other thing i can pick is the battery has probably seen better days.