Inspecting a pre-warmed car
A cold start is a one-time diagnostic event per visit: startup rattles, smoke on first fire and cold-idle behaviour reveal wear that disappears within a minute of running. Sellers who warm the car before you arrive erase that evidence, deliberately or not. Ask for the car cold, and in summer add a hot-restart test after a ten-minute heat soak.
Skipping the AC stress test in winter
Between November and March, feeble air conditioning still feels adequate, and the most expensive common fault on UAE used cars sails through unnoticed. Insist on measured vent temperatures at idle over five minutes, not a hand over the vent. A system that only cools at speed has a fan or compressor problem waiting for June.
Paying GCC-spec money for an unverified import
The premium for GCC cars exists because of cooling packages, dust filtration and warranty validity. If the door-jamb sticker, VIN history and cooling hardware say the car was built for Michigan or Osaka, the price should say so too. Verify the build market before negotiating, because the discount is your compensation for extra risk.