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Oct 12, 2010 21:52:54 GMT
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You'd need to run your car on more than a fiver or tenner's worth of a 'new' fuel to see any difference. As regards the 'bad batch/water in tank' theory I'd imagine this could be more likely to be the tank in the petrol station,or even possibly the road tanker itself.
I know bio fuel quality can vary wildly due to the road tanker not being cleaned out, though you'd think that 'big name' companies would clean their tanks out more often.
Supermarkets will almost certainly buy from whoever is cheapest, they do need to have their own 'unique' blend of fuel but that wouldn't be a problem to any refinery or even storage depot. I was once told by someone very much in the know not to use a certain premium brand fuel in older cars as it attacked the plastic in/on fuel pumps.
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Corsa Apology Champion 2014.
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Oct 12, 2010 23:56:45 GMT
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Cant think of anything other than fuel though, as we struggled up even the slightest of inclines after putting the fuel in, but the £5 of Morrisons fuel really did make a difference (put in when the fuel light had been on for 20 miles)
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1993 Fiat Panda Selecta
2003 Vauxhall Combo 1.7DI van
2006 Mercedes Kompressor Evolution-S AMG SportCoupé
"You think you hate it now, wait til you drive it"
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I did read that petrol has had the ethanol level changed this past year and the Ital runs like a 'bag of........' now. Using a mix of Morrisons, Tesco 99 and Optimax and it runs reasonably well, but suffers from fuel starvation if left for more that 20mins after a run. Quick blast with Easystart cures that, but I'm going electric pump soon to try and cure it permanently. The ethanol in the fuel dries out rubber diaphragms and flap/poppet valves, so you end up with weak pumps and leaky joints. This has been shown here reliably as a causal factor, as we've had a modest amount (4-10%) ethanol in petrol for years. The inner rubber seals on the fuel lines on my GTA have failed where they're in contact with the fuel, the outers are still fairly reasonable. --Phil |
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Lawsy
Posted a lot
Posts: 2,615
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i've been running the 89 passat on the shell fuelsave for the last 1500 miles, averages 35 mpg and seems to now be running smoother
only reason, shell in reading is 2 - 3p a litre cheaper than all the others i pass (i guess morrisons and asda or same, but i don't pass them and a 10 mile detour would negate the savings)
so shell fuelsave for me, but I do brim the tank every fill up, 60 litres, and due for a fill today so may go for V power as a try..
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ChasR
RR Helper
motivation
Posts: 10,269
Club RR Member Number: 170
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Oct 13, 2010 20:14:13 GMT
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My moderns run fine on most fuels I notice with little discernible difference. The 205 is the most sensitive. On 95 it is pretty flat (I remember my dad driving when I was a tight  and telling me that he thought there was something wrong with it. On V-Power or Super it's fine. Although after reading the Haynes it appears I'm only meant to run that car on 97 RON + (later cars apparently are ok) (Ooops...). The MGB I think ran a little flatter on 95. The biggest difference I noticed was dieseling. It dieseled for England on 95 (Maybe it ran hotter with the retarded ignition timing (I retarded the timing by a degrees) . On Super et al. the dieseling is non existant. I remember it used to always diesel when we bought it too. The timing for that car as a result is set to stock. I think Modern engines and Stateside cars (where I believe 95 was not available (hence different specs from British vs. US cars (I know most BL cars over there towards the end ran lower compression ratios), the fuel quality does not as large a difference. |
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Most stuff here (with exception of sportier models, and apparently my Renault) is tuned for 87 octane. Let that not confuse because here the number on the pump - usually 87, 89 and 91 refer to (RON+MON)/2 average. Which works out roughly as 87 = 90 RON, 89 = 92 RON, 91 = 95 RON
People say they have trouble running import stuff, especially newer J-tin which will have trouble with detonation as it's specified to have 97 RON on up, which is hard to obtain in a lot of places (93 R+M). Result is bad performance and sometimes damage to the innards if on boost with unstable fuel.
That and the fuel down in the South here has a lot of additives in it to stop it from going off in the hot weather. It smells quite heavily of xylene... so think yourselves lucky the fuel is at least within fairly strict standards there (it is here but what you pump might have been sat in a damp tank for several months).
--Phil
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Shell FuelSave petrol... did it eat my engine?
YES
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Someone just shot the elephant in the room. |
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