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The 986 in Europe has secondary air injection. Noise emissions are different. USA exhausts of that period are louder.
The car is optimized for Super Plus as a minimum, which in Germany is ROZ 98 (88 MOZ).
There is also 91 ROZ (82,5 MOZ), 95 ROZ (85 MOZ) 100 ROZ (88 MOZ) and 102 ROZ (88 MOZ) fuel available.
ROZ means Research Oktan Zahl
MOZ means Motor Oktan Zahl = engine octane value
AON – Average Octane Number (USA) is calculated by (ROZ+MOZ):2
In this case 98 ROZ plus 88 MOZ / 2 = 93 AON.
So the AON numbers in general are lower than the ROZ numbers which is used for classification over here in Germany.
Regards, Markus
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