Erm, I thought if you change jobs, then you get a new residence visa, assuming your company is sponsoring your residency (if you have residence visa from property or spouse, different story). At least that's what happened to me.
My principal is to get money out of my bank account before I tell company I'm leaving (actually, I opened a new bank account with different bank). It's happened that bank freezes accounts until outstanding debts (loans, credit cards) are cleared up as soon as company tells bank that they will be cancelling residence visa.
Car don't worry about unless you have a car loan - then you'll have to pay it off and sort out ownership. Do this before bank knows you're leaving. If you had a personal loan, you are already car owner. Here's more about
visa cancellation in Dubai.