buyer beware

Translations
покупатель будь осторожен
When purchasing a used car, it's always a case of buyer beware.
При покупке подержанного автомобиля всегда нужно быть осторожным.
Definitions
A warning to consumers that they should be cautious and conduct due diligence before making a purchase, as they may be responsible for checking the quality and suitability of the goods or services.
Words
buyer

noun
покупатель
beware

verb
берегись