Which fuel do you buy for your Aston Martin ?
Discussion
Always use this highest octane fuel you can find, and remember that freshness counts!! A station that is always busy gets deliveries
More tegularly so fuel is fresher compared
To a station in the middle of nowhere that only gets 1 delivery a month.
More octane is better, and freshly renewed stocks are better.
Without knowing your static compression ratio, or wether or not you have KR, octane gives
You a safety margin around lots of Undesirable Phenomena such as shattered pistons (worst case) and excessive bearing wear due to insufficient oil viscosity due excessively rich mixtures diluting oil due to the cooling effect of an over rich mixture being used in some scenarios as a method of KR.
Too many undisclosed variables to be certain but the fact remains that more octane is more
Protection.
If you object to paying the
Premium then buy cheap fuel and add 20% toluene by volume.
More tegularly so fuel is fresher compared
To a station in the middle of nowhere that only gets 1 delivery a month.
More octane is better, and freshly renewed stocks are better.
Without knowing your static compression ratio, or wether or not you have KR, octane gives
You a safety margin around lots of Undesirable Phenomena such as shattered pistons (worst case) and excessive bearing wear due to insufficient oil viscosity due excessively rich mixtures diluting oil due to the cooling effect of an over rich mixture being used in some scenarios as a method of KR.
Too many undisclosed variables to be certain but the fact remains that more octane is more
Protection.
If you object to paying the
Premium then buy cheap fuel and add 20% toluene by volume.
LordBretSinclair said:
There are a relatively few refineries in the UK so wherever you buy your fuel from it will likely to have come from the same place. No anti knock on the "old Vantage" so no substantial benefit in putting 98 in and certainly no advantage in paying over the odds.
V8 has anti knock, so is better with higher octane fuel V12 didn't have anti knock, so high octane fuel is a waste of money
craig elam said:
have a look at mikes bamford rose channel on youtube , ethanols a problem for high performance cars
I did wonder whether ethanol would be mentioned, and I think you are the first to do so Craig.
For my classic cars, I have always use non-ethanol petrol, purely because of the widespread damage to the old type rubber components used in the fuel systems.
I had thought there were no adverse effects of any type with modern cars.
It therefore was a surprise to me, hearing Michael Beake's opinion, about a reduction in optimal engine performance under full throttle. Although some AM engines have anti-knock sensors which make adjustments, it sounds as though there is no adjustment when 5% or 10% of the fuel is less combustible (if that is the correct word).
ESSO premium is used for my classics, so I will now use that petrol for my AM. Additional cost, but many of us do low annual mileages, so relative.
Tim pointed out the regional refinery aspect. I cannot remember, but I think there might be a geographical area, where the ESSO branded fuel does contain ethanol.
Edited by Jon39 on Saturday 25th January 15:39
Neil1300r said:
LordBretSinclair said:
There are a relatively few refineries in the UK so wherever you buy your fuel from it will likely to have come from the same place. No anti knock on the "old Vantage" so no substantial benefit in putting 98 in and certainly no advantage in paying over the odds.
V8 has anti knock, so is better with higher octane fuel V12 didn't have anti knock, so high octane fuel is a waste of money
Edited by ds666 on Saturday 25th January 18:09
My basic rule has become... if your engine has a knock sensor then as high octane as you like and stick to it. Or get the ignition set for high octane... or use basic unleaded. It is far better to use high octane supermarket if you must rather than 95RON posh brands - it takes a trice for the knock sensor to react to 95RON but ages to return to high octane to save the engine.
I understand the peak performance issue with Ethanol but most quality high octane is 5% so I'm not that bothered with modern vehicles (it caused swelling of plastic petrol tanks on some bikes like Aprilias, but a few days drying out and they shrink back.) Anyway, I have no Esso's around and for me that would, dare I say for an everyday car, be bordering on obsessive?
I understand the peak performance issue with Ethanol but most quality high octane is 5% so I'm not that bothered with modern vehicles (it caused swelling of plastic petrol tanks on some bikes like Aprilias, but a few days drying out and they shrink back.) Anyway, I have no Esso's around and for me that would, dare I say for an everyday car, be bordering on obsessive?
>>add 20% toluene by volume< ??? Used to clean planes electrical bits with that, and 20% seems rather a lot!
The trouble with this subject is it lacks facts - always has done. The suppliers don't print fact they print marketing guff like 'enjoy the freedom of the road more with Vmax' or 'Ultra Premium sexy slick - because you are as handsome as your car'. All we can compare is Octane. I had a really good look once and found nothing - if it said that Vmax had 1% more graphite than Tesco Extra Value petrol I'd buy it. But you can never find out!
The trouble with this subject is it lacks facts - always has done. The suppliers don't print fact they print marketing guff like 'enjoy the freedom of the road more with Vmax' or 'Ultra Premium sexy slick - because you are as handsome as your car'. All we can compare is Octane. I had a really good look once and found nothing - if it said that Vmax had 1% more graphite than Tesco Extra Value petrol I'd buy it. But you can never find out!
Static compression ratio and air intake temperature are some of more pressing concerns when considering the likelihood of preignition/knock/detonation.
Regardless of the systems employed on the V12 it is still a machine subject to the same constraints and parameters as any other.
Chemistry and physics don’t lie.
Do you enjoy replacing purposefully damaged components?
Regardless of the systems employed on the V12 it is still a machine subject to the same constraints and parameters as any other.
Chemistry and physics don’t lie.
Do you enjoy replacing purposefully damaged components?
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