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Just stuck 97 RON in

lloydsound83

Trainee
Joined
4 Mar 2020
Messages
68
I've had no choice but to put some BP ultimate - 97 RON in the car as I couldn't get shell or Tesco. It says on the filler flap 98 RON so technically I'm putting 99 in usually anyway so will 1-less be ok?
 
Yes, I'd be surprised if you notice any difference.

Your car should run ok on 95 RON, you will lose some performance but the car should adjust automatically and it won't do any harm.
 
lloydsound83 said:
I've had no choice but to put some BP ultimate - 97 RON in the car as I couldn't get shell or Tesco. It says on the filler flap 98 RON so technically I'm putting 99 in usually anyway so will 1-less be ok?

Although you should use min 98 RON, you can use 97 RON without major problems but I wouldn't attempt to use 95 RON regularly in a 991 ever.

I'd suggest running out the tank before adding 99 RON - so you have a full tank of pure 99 RON, rather than a mix of the two.

In the meantime, the DME (ECU) will adjust the ignition timing for the slightly lower quality fuel and retard it to prevent knocking. These adapted values won't be reset until the DME recognises that the correct grade of fuel is being used and can re-calibrate (advance) the ignition back.

Once you've refilled with 99RON you can either wait for the adaptation values to correct themselves and full power be restored (which may take some time in general use), or do a hard reset and then drive it fast & under load, which should re-calibrate the DME sooner.

Edit: Typing that whilst DeMort answered in half the words :)
 

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