If I bought a used car and it broke down less than 10 hours later, if there was no "as is" clause in the contract can I sue?

If you bought a used car "as is' from a private party and you can prove that the private party did not disclose all known problems with the vehicle before you bought it to you, you would have a basis for bringing an action for concealment. The measure of your damages would be the tow charges and the costs of repair.

I suggest that the mechanic who has fixed the vehicle be consulted as a possible expert witness as to its problems and possible knowledge of the problems by the seller.