If car is GCC specification, then you are fine with hot weather as they come prepared for 50+ degree heat. I had Cayenne turbo and VW each for 2 years and they worked perfectly fine in Dubai heat.
If car is non-gcc, like EU or US specs then don't get tempted even on half price as they will make you pay double during the heat. I burnt my finger once in Jeep Grand Cherokee US specs, that has been always overheating and in end sold as-is on recovery truck.
All car dealer have big wasta here and pay enough bribe to get their car pass for first time and then second time onward RTA dont make much noise as it's in there system. Where as RTA has very high standard for you and me when we stick one sticker behind our car, they fail our car but let go the repair chasis for few hundred dhs.....!
Thank you Abdul Basit, I really enjoyed your company and it was a great pleasure to meet you too. Thanks Barry, free service for the birthday boy, valid for 1 month from the date of issue. hahahaha. Thanks Trek, you guys are awesome.