Premium Unleaded Petrol

tinalives

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saintjanet

The premium petrol will do no harm to your car,unless there is something wrong with the petrol itself,as per the problems with supermarket fuel experienced by some people recently.

I would seek advise from a mechanic, it could be a coincidence that it went wrong just after you filled up.If you are in the RAC/AA you could call them out.Not all garages rip you off either,just use one with a decent reputation.

steveo3002

ask on https://www.clubgti.com or https://www.edition38.com forums

shouldnt be anything to do with petrol tbh

mjr600

As a little explanation and to keep it simple Premium Unleaded fuels are produced to be 'squashed' by your engine more before they are burnt to produce power. High revving/compression cars benefit from this fuel, my last jap pocket rocket would only run on the stuff but for your average car there is no difference.

Your VR6 is a powerful but lazy engine, it does not need to run on premium unleaded.

Premium fuels often also contain chemicals designed to clean your fuel system and the valves in your engine. There is a chance that the premium fuel has pulled some of the muck out of your system and the process is causing the poor running.

My advice is to do one of two things.

Fill the rest of the tank with Premium Unleaded and take it for a long drive, blow the cobwebs out and see how it runs. If its ok run it on Premium for the next five tanks or so then revert to the cheaper stuff.

Or

Find a local VW specialist (main dealer will be pricey), ring and ask if they use the VAG-COM diagnostic system and if so book it in for a check up. The VAG-COM system will be plugged into the cars computer and will run a check on your car. It will give the technician error codes which will tell him what the problem is. Then take it from there, hope that helps.

tinalives

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tinalives

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mjr600

There is one other thing you can do now that the car has settled down.

You can reset the ECU which is the computer that controls the fuel injection system. This is done by removing one of the leads from the battery terminal and leaving it off for about an hour. The car will revert to the settings it had when it left the factory.

Put the lead back on and start the car, let it run for twenty minutes or so without touching the accelerator at all, this gives the ECU time to realise that it is using Super Unleaded, take account of oxygen levels and lots of other techie stuff. Then take for a long drive, drive it in the same way you do everyday and the ECU will make further calculations about how best to operate your engine with the new fuel.

I know people who have attained up to a 10% hp increase from this method, verified by rolling road, if you want the extra power don't drive it normally, really thrash it and the ECU will adapt and remember.

The car may hiccup on and off for the first few miles after the ECU reset, this is normal and is due to the computer adjusting the fueling for best results, when it's happy it'll settle down.

I can assure you that this little trick does work and works well on cars that have a few miles under their belt, I have experienced it myself.

The ECU reset also means your clock will be out, radio may need starting with the code but should not effect a factory alarm/immobiliser.

A new fuel filter is a good idea too.

tomstickland

As a little explanation and to keep it simple Premium Unleaded fuels are produced to be 'squashed' by your engine more before they are burnt to produce power. High revving/compression cars benefit from this fuel, my last jap pocket rocket would only run on the stuff but for your average car there is no difference.

In the UK Premium unleaded is the basic fuel.
Super unleaded is the higher Octane rated fuel.

The symptons could well be caused by a fault, nothing to do with fuel.