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Originally Posted by Imolator
I noticed that in the WQ Fez that I test drove, and asked the Sales guy if it was running on 91ron, it was. When I picked up my fez it was gravelly as well, but after filling up with Vortex98.......
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I found that out too. The engine sounded and felt coarse when I drove it out of the dealer. I wasnt panicking since I'm 100.6% sure that the just put in ULP. When it was time for me to fill-up, I used, at the time, Shell Optimax and she ran beautifully instantly!
Then 3000-km service arrived, I asked them to put in Castrol EDGE 5W-30 and new oil filter..... NVH was further improved.