Boxter S & Super unleaded
- Thread starter Crabbers
- Start date
Super .... because that is what the hand book recommends as first choice ...Good luck with the new car .... [8D]ORIGINAL: Crabbers
Morning all.
Collecting my Boxter S this afternoon & was wondering if people usually run it with super unleaded or regular & if so why?
Would appreciate your feedback.
RS60 Spyder
[]
Super
On my first 2.5 Boxster I didn't read the manual closely enough and filled it with normal unleaded for the first 18 months. I remember clearly the day in 2001 when I first put V-Power in it. There was a perceptible difference as I left the garage forecourt! Hard to quantify but the engine seemed much much smoother all of a sudden, and pulled much more strongly. I couldn't believe it and have alway used Super U/L ever since.
Greg
Greg
Sorry to rain on your parade guys, but having owned a 2.7 and 3.4 Boxster and now 3.4 Cayman I can say that the only difference I have noticed when trying 98 is the extra cost of 2.50 per tank. Measure the consumption full tank to full tank and no difference whatsoever. I did not try Shell or BP, only use Sains as it all comes from the same tank. Guess I just don't thrash the engine as much as you guys to see any change.
Helen Goff
No.1 Poster
like wise. although i always use super in my 356 and panamera as it does seem to make a diffrence in them. [:-]
your fuel consumption may be the same but I can assure you it doesnt "come from the same tank"as shell or BP.-just talk to anyone who has seen the damage caused to high end motors by the supermarket petrol and you will never touch the stuff again for your "special"car.
I know I certainly wouldnt!!
Interesting had the conversation about premium over supermarket fuel over a pint on Sunday with a guy who works for an oil company based at a refinery. His position was that, the refinery supplied fuel to supermarkets and premium brands without any difference from the bulk storage they use. What is different is the additives that are added to each order, basically the top fuel brands have better additives added to meet their spec. I have heard this before when I use to work for a car company, and strangely when any new model exhibited a minor engine running issue that had not been experienced before and could not be resolved using the standard diagnostics the advice was to try changing to premium brand fuel if it was not being used, it worked in a fair few cases.
Br
Mic
Br
Mic
John H
New member
Remember the fuel strike of a few years ago?
One thing I learned from that was that in Scotland at least ALL petrol comes from Grangemouth refinery, whether it is destined for ASDA, Esso, Sainsbury's, Shell or whoever. I am prepared to believe that each may be brewed with a slight variation in additives, but it is all the same basic stock. I will also accept that Super, V Power or whatever has a slightly higher rating, but I am also tempted to believe the real benefit from these fuels is that they have a higher concentration of detergents, and that is why you often feel the benefit of them after prolonged use of fuel with less detergent. I run all my cars on ASDA petrol (or diesel), have done for decades, and have never had an issue. I occasionally run a tank of something more expensive, just for the cleaning benefits, but much beyond that I believe most of the claims to be pure snake oil.
One thing I learned from that was that in Scotland at least ALL petrol comes from Grangemouth refinery, whether it is destined for ASDA, Esso, Sainsbury's, Shell or whoever. I am prepared to believe that each may be brewed with a slight variation in additives, but it is all the same basic stock. I will also accept that Super, V Power or whatever has a slightly higher rating, but I am also tempted to believe the real benefit from these fuels is that they have a higher concentration of detergents, and that is why you often feel the benefit of them after prolonged use of fuel with less detergent. I run all my cars on ASDA petrol (or diesel), have done for decades, and have never had an issue. I occasionally run a tank of something more expensive, just for the cleaning benefits, but much beyond that I believe most of the claims to be pure snake oil.
Well our RenaultSport runs better on Shell V.Power than it does on Tescos 99 Octane stuff.... and far better than on 95 of any kind.
Funny though, it's designed for 95.
The same situation happened for it's predecessor - although that was even more pronounced!
The Boxster has only had 95 in it once or twice, apart from when we were in Italy where 98 didn't seem to be on sale anywhere. Last time we were in Germany it got 102 when Aral or Shell was available. Can't say I noticed any difference but it was pennies more per litre, unlike when BP had 102 available in the UK when they charged pounds more! Made me feel good putting it in even if the car didn't notice []
Funny though, it's designed for 95.
The same situation happened for it's predecessor - although that was even more pronounced!
The Boxster has only had 95 in it once or twice, apart from when we were in Italy where 98 didn't seem to be on sale anywhere. Last time we were in Germany it got 102 when Aral or Shell was available. Can't say I noticed any difference but it was pennies more per litre, unlike when BP had 102 available in the UK when they charged pounds more! Made me feel good putting it in even if the car didn't notice [
]Hi All. As some have said, read the manual, it tells you what the engine does when running low octane fuel. Therefore the engine detects low octane fuel, adjusts accordingly (sorry, my manual is in the car otherwise i'd get you the exact words). I.e. your car will can run on 95RON. It will adjust the timing / anti-knock. The car will run fine but you will not have maximum performance. You 'should' notice the difference with 98RON. I did.
As for high octane fuels of different brands, that is less clear cut although I can say this. After noticing the difference with high octane and low octane fuels, I initially stuck to Tesco Momentum99 and Shell V Power. By mixing these two before the tank was empty, I didn't notice the difference between them. However, on filling the tank from empty with Tesco 99 and then subsequently doing the same with Shell V Power, I did notice the difference. I.e. as the tank often had majority V Power, I was masking the inferiority of Tesco 99, in my opinion. My Cayman definitely runs better on V Power. If I mix them, the difference is not noticeable if I still have a lot of V Power in the tank prior to putting in some Tesco 99 but if I have predominantly Tesco 99 in, it is not as good. What does not as good mean? The engine revs more freely and the acceleration is better. That is not from the manual, it is very noticeable to me in my car (which is all I can speak for). The difference is noticeable but your car will not feel bad if you've never used V Power. As V power is dearer than Tesco 99, I have no reason to make myself notice a difference just to make myself pay for it. If the fuel is indeed from the same refinery and its the additives that make the difference then they certainly do. I'm not trying to convince anyone to my view but for those who haven't noticed a difference, consider putting a signifcant amount of V Power in when the tank is empty so as not to dilute it. I only evey use V Power now as it is worth it to get the performance that I paid a lot of money for (i.e. the car) rather than nine tenths of it.
As for high octane fuels of different brands, that is less clear cut although I can say this. After noticing the difference with high octane and low octane fuels, I initially stuck to Tesco Momentum99 and Shell V Power. By mixing these two before the tank was empty, I didn't notice the difference between them. However, on filling the tank from empty with Tesco 99 and then subsequently doing the same with Shell V Power, I did notice the difference. I.e. as the tank often had majority V Power, I was masking the inferiority of Tesco 99, in my opinion. My Cayman definitely runs better on V Power. If I mix them, the difference is not noticeable if I still have a lot of V Power in the tank prior to putting in some Tesco 99 but if I have predominantly Tesco 99 in, it is not as good. What does not as good mean? The engine revs more freely and the acceleration is better. That is not from the manual, it is very noticeable to me in my car (which is all I can speak for). The difference is noticeable but your car will not feel bad if you've never used V Power. As V power is dearer than Tesco 99, I have no reason to make myself notice a difference just to make myself pay for it. If the fuel is indeed from the same refinery and its the additives that make the difference then they certainly do. I'm not trying to convince anyone to my view but for those who haven't noticed a difference, consider putting a signifcant amount of V Power in when the tank is empty so as not to dilute it. I only evey use V Power now as it is worth it to get the performance that I paid a lot of money for (i.e. the car) rather than nine tenths of it.
i work in a engine dyno test lab, all calabrations on engines are done on 95 ron fuel( knock control active) ,all these engines make their power specs on 95 ron, we make and test engines for ford ,volvo and jag . current engines tested ford 1.25 ,1.4 ,1.6 ,volvo si6 and jag v8 5 litre &s/c , the focus rs 2.0l was done on 98 ron fuel,
I have used V Plus since getting my 2006 Cayman S in 2007 and have noticed a difference in MPG when using some garages ( maybe 95 octane ) performance didn't seem that different but MPG also improves in hot weather, I have tried Tesco 99 but found no improvement over Shell 98and will not use supermarket fuel again as it does not have the cleaning additives.
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