For GCC-spec Audi Q5 models (most common in the UAE), the manufacturer mandates Special 95 (95 octane) as the minimum requirement. While you can technically use E-Plus 91, it is not recommended for long-term performance and engine health. The turbocharged engines in models like the 2.0 TFSI (252 hp) or 3.0 TFSI are designed for higher compression and can experience premature knocking with lower-octane fuel, especially under common UAE conditions like aggressive acceleration on Sheikh Zayed Road or prolonged idling with AC in summer traffic.
The cost difference over the vehicle's lifetime is marginal compared to potential repair costs. Here is a basic cost comparison for a GCC-spec 2023 Audi Q5 2.0 TFSI Quattro, assuming an average annual mileage of 25,000 km and a fuel economy of 11.5 km/l (a realistic figure for mixed Dubai-Abu Dhabi highway and city driving):
| Fuel Type | Price Per Liter (AED, est.) | Annual Fuel Cost (AED) | Cost per km (AED) |
|---|
| Special 95 | 3.05 | ~6,630 | ~0.265 |
| Super 98 | 3.20 | ~6,957 | ~0.278 |
| E-Plus 91 | 2.85 | ~6,196 | ~0.248 |
However, the Total Cost of Ownership (TCO) calculation must factor in more than just fuel price. Using E-Plus 91 can lead to increased carbon deposits, reduced efficiency over time, and potential long-term damage to high-pressure fuel injectors and turbochargers, which are costly repairs. The RTA Dubai's vehicle inspection (MOT) test can flag engine misfires or excessive emissions linked to poor fuel combustion. A 2023 market report from the UAE Ministry of Energy and Infrastructure on fuel quality also correlates proper octane use with sustained engine performance and lower emissions. For a premium vehicle, the small annual saving of ~434 AED from using E-Plus 91 over Special 95 is negligible when viewed against annual depreciation of ~15-20% (roughly 30,000-40,000 AED for a nearly new Q5) and potential maintenance impacts on resale value, a key concern for UAE owners who frequently change cars every 3-5 years.
