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Filling a 955 Cayenne Turbo with 91 RON in Saudi Arabia

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I'm living in Saudi Arabia and actually driving a 2004 Cayenne Turbo.

In KSA, you can usually find 91 and 95 RON petrol in towns. But when you want to make a trip (from Al Kharj to UAE border on Motorway 10 through the desert), some times petrol station only have 91 RON.

Do you think that filling the Cayenne with 91 for a 400 km trip and driving around 180-200 Km/h (https://goo.gl/maps/0cRn5) would be harmful for the engine?

Thanks for your help!

P.S.: I'm not trying to save money, as petrol is so cheap here per litre : 0.12$ for 91 and 0.16$ for 95....(picture attached filling up my Sequoia).


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I think the higher octane is mostly to help under boost to help with eliminating detonation. As long as you don't drive hard when you're running the 91 you should be fine.

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I agree. 91 RON is quite low, if you keep the speed down and keep out of hard acceleration (staying out of the boost) you will be fine. 95 is really the minimum you should be running. The knock sensors will retard timing and lower boost if they detect detonation (I believe it is Timing first followed by Boost). But for a cross country drive driving easy it should be fine.

Edited by hahnmgh63

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:thankyou: to both of you for the answers.

I will fill up with 95 at Kharj and hope that I will find some in 1 out of 3 petrol stations in the desert. It is only 440 km but as it is a straight road with almost no traffic, I usualy drive quite fast and empty the tank after 360-400 km. If there is no 95, I will fill up with 91 and reduce the speed...

Again thanks for your help!

P.S.: by the way, with 95 RON, the CTT stil works fine, check here

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