Misfire After Filling With Tesco Fuel

[BFG TERRANO]

windy1 said:

Ha Ha very funny Tescos fuel is Esso!!!!

Nearly but not quite.

[TooMany2cvs]

ohtari said:

Err...

Not quite. RON is Relative OCTANE Number, octane being an eight carbon alkane molecule. Ethanol is C2H5OH, a 2 carbon chain alcohol.

The key is the Relative part of RON, pure ethanol has a RON of 108.6, hence the higher proportion of ethanol content in the fuel, the higher RON rating.

And there was me, thinking the R stood for Research, as opposed to Motor Octane (derived from actual testing in a motor).

Fruitcake said:

This time last year my forged engine went into my Impreza.

Fit a genuine one next time?

[swisstoni]

I can't believe supermarkets have their own refineries. Shirley they just buy in bulk off the big names?

[e21Mark]

My M3 may well be a crap car but the fact remains that it ran like st after filling with Tesco fuel, here in Cornwall.

[750turbo]

swisstoni said:

I can't believe supermarkets have their own refineries. Shirley they just buy in bulk off the big names?

They don't.

They use the same refineries as all the others, just that the snake oil additives are somewhat different I believe.

[RedAlfa]

Never had a problem with Tesco fuel, but I wish my local branches would maintain their bloody Pay@Pump machines properly. The bar code scanners and card scanners frequently don't work, and the print receipt function is frequently INOP

[Condi]

e21Mark said:

My M3 may well be a crap car but the fact remains that it ran like st after filling with Tesco fuel, here in Cornwall.

It was probably coal dust. HTH.

[Sump]

Never had any issues with any petro/diesel in any of my cars from anyone.

Get a better car.

[daemon]

Sump said:

Never had any issues with any petro/diesel in any of my cars from anyone.

Get a better car.

+1

Cant help but think that 0.01% of cars that seem to have "problems" with supermarket fuel would have had the problems anyway.

Car develops a misfire 200 miles after putting in Tesco fuel = must be that cheap supermarket fuel.
Car develops a misfire 200 miles after putting in BP fuel = must be an engine fault.

[226bhp]

ohtari said:

226bhp said:

ohtari said:

Ethanol is taxed as a drinkable alcohol and hence expensive

The Impreza run fairly well on the 97 RON BP, but considering that it was designed around the 100 RON Japenese fuel, more is always better!

No, more isn't always 'better', although you have to quantify what better means.

Plant derived Ethanol fuels are cheaper to buy than Petroleum based.

More, meaning a higher a ethanol content and therefore a higher RON is better. For a tuned forced induction engine, a higher RON allows a higher boost pressure without knock, allowing more power to be produced for a given RPM.

More RON equals better.

It's only better for power if the engine is remapped to take advantage of it, otherwise it's a waste of money. Some engines will recalibrate themselves to a certain degree, many won't.
It isn't 'better' for MPG as that will go down the greater the Ethanol content.

Although prices of fuel have dropped dramatically, in this Country we are still being ripped off because the vendors are charging you the same money for a part Ethanol content fuel, but due to EU subsidies/ruling they are actually buying the Ethanol cheaper than petrol.
So basically they are putting in a cheap additive and pocketing the money rather than passing the savings on to you.

In many countries you can buy 85% Ethanol content fuel quite cheaply, in some European countries you have a choice at the pumps of 100% petrol or 85% petrol, the latter is cheaper.

Whilst Ethanol is a good fuel for outright power (if remapped accordingly) it gives poor economy and it is quite a stupid fuel in that it is produced from food crops. We have a massive overpopulation problem which is being largely ignored, so to use the limited crops we have to fuel cars is quite bizarre when you think about it.

Sorry, drifted a bit off topic there.

[HannsG]

And here I was thinking about brimming the M with Tesco 99 in Longeaton when we go to see the outlaws!!!

[daemon]

HannsG said:

And here I was thinking about brimming the M with Tesco 99 in Longeaton when we go to see the outlaws!!!

Your car will immediately start running off a cylinder and stop a mile up the road. You only have to look at Tesco filling stations and see the road past it clogged up with all the cars broken down immediately after filling up.

Oh, no hang on.....

[Stoatman]

I always understood it's actually the MON that becomes the most important under high stress conditions. Ron for low speed cruising. Mon for full throttle high speed, up hills etc.

[226bhp]

HannsG said:

And here I was thinking about brimming the M with Tesco 99 in Longeaton when we go to see the outlaws!!!

Do it and report back.


hopefully not from the hard shoulder

[Foppo]

Stopped using the higher grade Texaco diesel.

Started using Tesco diesel for about three tanks.Engine started to sound rough and hesitating on pick up.1.6 H.D.I Citroen engine.

Back to Texaco diesel or Shell and BP.

[FunkyNige]

750turbo said:

They don't.

They use the same refineries as all the others, just that the snake oil additives are somewhat different I believe.

Do we know what additives are added to the various different fuels or is it a commercial secret?

[pingu393]

HannsG said:

And here I was thinking about brimming the M with Tesco 99 in Longeaton when we go to see the outlaws!!!

Or you could make a 10 mile detour and fill with Nitro+ at Priory Island . No speeding on the Brian Clough Way from Bardhills if you do .

[daemon]

Foppo said:

Stopped using the higher grade Texaco diesel.

Started using Tesco diesel for about three tanks.Engine started to sound rough and hesitating on pick up.1.6 H.D.I Citroen engine.

Back to Texaco diesel or Shell and BP.

Diesel is pretty much diesel (unless its been tampered with), and the "higher grade" is adding snake oils in there to give you false positives about your engine condition.

If your engine was running rough on tesco diesel then its because your engine is running rough. Additives in the Texaco high grade could be hiding that.

I'm running my Golf 1.6TDI on Tesco / ASDA diesel and the occasional big brand supplier and have done for 27,000 miles so far. Never noticed ANY difference in pickup or running of the car, and if anything the times i've recorded the best brim to brim MPG recordings have been on supermarket fuels.

[TheAngryDog]

My car runs fine on Tesco 99. No different to when I ran it on shell v power+. I'm not spoilt for choice in Aylesbury for where I can fill up with fuel.

[lummox]

My Boxster S has only been run on Tescos Momentum for the 3 years i've had it and not missed a beat.