No one is buying a car from a rig in the gulf or serving on a ship and getting there friend/father or transport company to pick it up.
Never meet in a car park to sell your car. (peeps have been bashed)
Taking the keys of their car while they test drive yours - ah agh! ......The keys may belong to another stolen car - lol. (Check License + Rego papers - compare)
Avoid PayPal - always CA$H
walk away from higher offers and obvious poor engrish emails
@gmail addresses - be very wary
allclassifieds has been infiltrated for a year or two now
never publish email, phone number or addy (use the sale sites challenge capability)