“Most private sales of used cars are “as is” sales”可能是关键词。

网文：

... Most private sales of used cars are “as is” sales. However, your state laws govern these sales. A visit with an attorney - for which you will need to pay a fee - might be in your best interest.

And, or course, “not disclosing” is different from “affirmatively misrepresenting.”（故意歪曲）

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“I am not an attorney, so take it with a grain of salt. Some points:

1. The Seller, was he aware that his car had problems and did not reveal at sale？
2. Do you have any proof of No 1？
3. Did you ask the seller about the problems the car has, in writing？
4. Did he conceal the defects knowingly, in spite you asked in writing？
5. Why didn't you take the car to a mechanic for evaluation？
6. Did the Seller give you any written warranty with the purchase?

If not, when you buy a used car, it is “as is” and you have no claims. It is your responsibility to verify the condition of the vehicle before you buy.“