Petrol

That CSL is a remapped car. Running it on 95 Ron will make less power than a standard car running 95ron as the ecu will be retarding the ignition.

Never let the truth get in the way of a good story.

Often the things you need to be worried about are not noticeable over a few tanks anyway (injector deposits etc). Octane number is only telling you so much.
 
Mark1989 said:
Okay so Ive always wondered does buying the premium petrol actually make any difference?

I have a seat leon which I love but its just had the bog standard petrol put in it from asda etc, would I notice any difference if I started using the "premium" stuff
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If you have a car worth talking about or a car you plan on keeping for a long time from new or newish and want to look after it then buy premium not just because it's higher RON but the additional cleaning additives.

If you drive a banger or a vauxhall corsa then just buy whatever is cheapest.

So most people should be happy with supermarket fuel.
 
It's newish to me but is a 14 plate, it was used as a mobility car before I bought it I'm going to assume its always had bog standard in it tbh.

I plan on having it least next 3 years
 
My car is mapped on v power, so have never used anything else .. Also my filler flap has a sticker in in saying ron98+. On your normal daily car i would think the premium price £1.47 litre in my local shell outways any benifits you might notic!
 
Mark1989 said:
It's newish to me but is a 14 plate, it was used as a mobility car before I bought it I'm going to assume its always had bog standard in it tbh.

I plan on having it least next 3 years
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i would maybe put a tank of premium in it every 5 tanks or so. just for the cleaning additives. i take it's a bog standard leon and not the sporty one with a lot of power?

you won't notice any power benefits so if you are strapped for cash maybe worth just running cheap fuel and the money you would waste on premium fuel put it towards decent engine oil for when it's serviced and just make sure it's serviced regularly. premium fuel will cost you like £3-£5 per tank more than normal fuel. so 10 tanks worth will pay for decent engine oil. maybe then use premium fuel when you are caught short and the nearest garage isn't a supermarket.
 
Psycho Sonny said:
i would maybe put a tank of premium in it every 5 tanks or so. just for the cleaning additives. i take it's a bog standard leon and not the sporty one with a lot of power?

you won't notice any power benefits so if you are strapped for cash maybe worth just running cheap fuel and the money you would waste on premium fuel put it towards decent engine oil for when it's serviced and just make sure it's serviced regularly. premium fuel will cost you like £3-£5 per tank more than normal fuel. so 10 tanks worth will pay for decent engine oil. maybe then use premium fuel when you are caught short and the nearest garage isn't a supermarket.
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1.2 tsi se, 110ps, I would have opted for the 1.4 ideally but as my first car whilst over 20 insurance still over 1k.

Do appreciate all info :)
 
Depends how high the engine's compression ratio will go as to whether the ECU will actually make use of the extra RON. Most engines (as standard) probably won't go high enough to see a benefit. Usually you find high reving NA engines need it.
 
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Nasher said:
Depends how high the engine's compression ratio will go as to whether the ECU will actually make use of the extra RON. Most engines (as standard) probably won't go high enough to see a benefit. Usually you find high reving NA engines need it.
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What :confused: Compression ratio isn't variable
 
In my daily runners i'll use any fuel. My Westfield needs to use BP Ultimate or V-Power because the ethanol in the cheaper fuels is known to degrade the rubber fuel hoses used in the old Crossflow engine.
 
I've recently switched to momentum 99 and I can tell you, I've definitely seen a difference in how the car picks up and revs, it's like a new car - I also changed the stock air filter as well which helped it breath better.
 
Psycho Sonny said:
i would maybe put a tank of premium in it every 5 tanks or so. just for the cleaning additives. i take it's a bog standard leon and not the sporty one with a lot of power?

you won't notice any power benefits so if you are strapped for cash maybe worth just running cheap fuel and the money you would waste on premium fuel put it towards decent engine oil for when it's serviced and just make sure it's serviced regularly. premium fuel will cost you like £3-£5 per tank more than normal fuel. so 10 tanks worth will pay for decent engine oil. maybe then use premium fuel when you are caught short and the nearest garage isn't a supermarket.
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This makes no sense. The engine oil is largely irrelevant to many fuel cleanliness issues

What do people mean by premuium too? In a bog standard car I’d much rather a 95 ron decent brand fuel than supermarket high octane. And there is no way I’m touching super market diesel.

This isn’t even about what you notice short term as a driver. This is about maintaining performance and keeping the engine running as it should.
 
They are all the same before they mix any additives, its all EU standard fuel. :p

Debatable whether or not they are worthwhile long term. I mostly use BP standard unleaded in our 340i only because its the nearest petrol station.
 
Simon said:
This makes no sense. The engine oil is largely irrelevant to many fuel cleanliness issues

What do people mean by premuium too? In a bog standard car I’d much rather a 95 ron decent brand fuel than supermarket high octane. And there is no way I’m touching super market diesel.

This isn’t even about what you notice short term as a driver. This is about maintaining performance and keeping the engine running as it should.
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I wish I'd taken some photos to showed how clean the piston crowns and valve areas on the engine that came out of the MX5 at 115k miles

Run exclusively on Vpower at least in my ownership for the previous 12k miles and there was very little carbon build up
 
An owner of a Mondeo TDCI posted a picture of his EGR valve on here after running the car for a long period on BP Ultimate diesel and is was almost totally clean, anyone that has cleaned out an EGR valve will know it is normally jammed solid with buildup. I can't remember the full details but recall the car had over 200k on it. He also didn't suffer injector failure which is a very common fault on them. My wife's old diesel would go far further between DPF regens on the odd tank fuel of BP Ultimate/Shell V Power diesel that was put in it which would indicate the engine is producing less soot.

It all depends if you think it is worth the cost you could argue a car under warranty it won't matter but I expect further into the car's life it will have far healthier intake system, injectors and DPF.

I avoid supermarket fuel which is easy where I live as the local Shell & BP price match them, I do put premium diesel in for a period every so often I always think the noise level at idle is reduced but this could be a placebo effect.

On the petrol front I did 140k in my old MK5 Golf GTI exclusively on Shell V Power, I never had any injector faults and very little carbon build up on the rear of the intake valves. After 40k ish on Tesco Momentum my sister's S3 had two new injectors and needed the intake valves cleaned at the same time, the dealer told her to stop using super market fuel.

It would be very interesting to take two brand new cars and run them for several years one on BP Ultimate/Shell V Power and the other on super market fuel then strip down the engines and compare them.
 
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chroniclard said:
They are all the same before they mix any additives, its all EU standard fuel. :p

Debatable whether or not they are worthwhile long term. I mostly use BP standard unleaded in our 340i only because its the nearest petrol station.
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All beers are the same water until they add additives. Its a National UK fuel pool too

No debate on long term use
 
Dangerous Dave said:
An owner of a Mondeo TDCI posted a picture of his EGR valve on here after running the car for a long period on BP Ultimate diesel and is was almost totally clean, anyone that has cleaned out an EGR valve will know it is normally jammed solid with buildup. I can't remember the full details but recall the car had over 200k on it. He also didn't suffer injector failure which is a very common fault on them. My wife's old diesel would go far further between DPF regens on the odd tank fuel of BP Ultimate/Shell V Power diesel that was put in it which would indicate the engine is producing less soot.

SNIP (not relevant to my post).
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As the owner of a Mondeo 2.2 TDCi and having done 21k since I got the car, using only supermarket fuel & the occasional bottle of diesel cleaner (Redex etc) I can tell you that my EGR is almost clean too as I changed all my boost pipes for silicone ones recently. EGRs clean themselves provided you drive the car right meaning it gets hot enough to burn the crap off of itself. Blasting down the motorway for about 20mins @ 70mph will do just that.
 
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