Originally Posted by
Hillbilly
If so why then do VW say only to use it in an emergency and fill with 95 ASAP. If it did as you say it surely would be ok to use 91.
There is a loss of performance if the ECU actually reduces the ignition timing advance (retard) and adds fuel (rich). Both of which will also have the additional side effect of increasing fuel consumption. If VW said it was OK to use and people then used low octane all the time, which triggered the ECU into retard and rich, then people would complain about the lost performance and the poor (relative) fuel economy. So VW protects themselves by recommending 95 minimum. For sure it's about protection, protecting VW from customer complaints, plainly the car can handle it physically, otherwise there would be a "do not under any circumstances" warning.
Cheers
Gary
Golf Mk7.5 R, Volvo S60 Polestar, Skyline R32GTST
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