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Every tyre carries a DOT code moulded into the sidewall, and the last four digits are the part that matters here: two digits for the production week, two for the year. 3523 means week 35 of 2023. UAE practice, built on the Gulf standard for tyres, treats five years from that production date as the end of a tyre's legal life on the road, regardless of how much tread is left. The logic is chemical rather than mechanical: rubber compounds oxidise and harden with age, and the process runs far faster in a climate where asphalt surface temperatures pass 70 degrees in summer. An aged tyre can look showroom-fresh and still delaminate at highway speed.

There is also a traffic-law layer on top of the registration layer. Driving on worn or deteriorated tyres carries a fine of AED 500 and four black points under the federal traffic rules, and police can impound the vehicle. Tread depth below 1.6 millimetres, visible cords, sidewall cracking or bulges all qualify. In practice, summer blowout campaigns run by police in several emirates make this one of the more actively enforced vehicle-condition offences on UAE roads.

UAE motor insurance policies require the vehicle to be roadworthy, and tyres are the component insurers examine first after a serious single-vehicle accident. A claim following a highway blowout can be reduced or rejected if the tyres are found to have been beyond the five-year age limit, worn below the legal tread depth, or visibly damaged before the incident. The surveyor's report will record DOT dates as a matter of routine. In other words, running old tyres does not just risk the AED 500 fine; it can put the entire value of an accident claim in question, along with liability for damage to others.

Modification is the second trap. Changing wheel and tyre sizes away from the manufacturer's approved fitments, fitting different sizes front to rear where the maker does not specify it, or deleting run-flats on a car designed around them are all changes an insurer can treat as undeclared modifications. None of this means you can never change anything; it means changes should stay within the approved fitment list in your handbook, and anything beyond it should be declared to the insurer in writing before renewal rather than discovered by a surveyor afterwards.

Nitrogen inflation has real but small advantages. Nitrogen molecules permeate rubber more slowly than oxygen, so a nitrogen-filled tyre loses pressure somewhat more slowly over the weeks, and the dry gas carries no water vapour, which means slightly more stable pressures as temperatures swing and less internal corrosion of steel belts and TPMS valve hardware. In a country where the gap between a January dawn and an August afternoon can be 35 degrees, more stable pressure is a genuine, if modest, benefit. Airlines and racing teams use nitrogen for these reasons at extremes far beyond road driving.

One caution: mixed fills are harmless but pointless. Topping up a nitrogen fill with ordinary air at a petrol station does no damage whatsoever, and the widespread belief that it does keeps drivers running underinflated while they hunt for a nitrogen point. Correct pressure with plain air always beats low pressure while waiting for the right gas.