Daft question re petrol choice with engine type ..
Discussion
Hi,
In my recent cars , all WRXs , I have always used V-Power / Momentum mainly as a safeguard to protect the engines ( last 1 went bang just as I bought it! ) and obviously these turbo'd engines seem to prefer it.
Current car is now a n/a 3.0 H6 Outback and have been running it on the better stuff as a precaution .
The way fuel prices are going and now doing more mileage I have been thinking of trying the Shell "spiel" of getting more miles on their Standard UL.
Does the Pistonhead collective think ..
- there would be any benefit sticking with the V-Power / Momentum fuel choice ,as these engines aren't so likely to knock or go bang and turbo'd cars seem to gain more on it?
- if I mix Standard UL in with say current half a tank of V-Power / Momentum , is it going to upset anything as it'll be mixed Ron?
Your opinions are appreciated,
Steve
In my recent cars , all WRXs , I have always used V-Power / Momentum mainly as a safeguard to protect the engines ( last 1 went bang just as I bought it! ) and obviously these turbo'd engines seem to prefer it.
Current car is now a n/a 3.0 H6 Outback and have been running it on the better stuff as a precaution .
The way fuel prices are going and now doing more mileage I have been thinking of trying the Shell "spiel" of getting more miles on their Standard UL.
Does the Pistonhead collective think ..
- there would be any benefit sticking with the V-Power / Momentum fuel choice ,as these engines aren't so likely to knock or go bang and turbo'd cars seem to gain more on it?
- if I mix Standard UL in with say current half a tank of V-Power / Momentum , is it going to upset anything as it'll be mixed Ron?
Your opinions are appreciated,
Steve
What does Subaru recommend? I have no idea about your engine specifically, but as I understand it, on any car which isn't designed (mapped?) specifically for the higher RON stuff, there will be no benefit and possibly even a negative effect on power/fuel consumption due to the lower calorific value in higher RON petrol. In other words, unless the manufacturer says to use it, don't. 
Another can of worms entirely, but I do find differing consumption between the (95RON) fuel that I use even on my small engined cars. On the Escort, I get significantly better fuel consumption running BP than anything else. A consistent 4-6 mpg increase over anything else, over exactly the same journeys. About 10% difference, which makes it worth the extra 3p a litre. Texaco seemed to get a bit better mpg than the others I tried but not big enough of a difference like the BP, nothing that would sway me to sticking with Texaco garages.
However on the Astra it really doesn't make any difference to consumption what I put in (although rightly or wrongly, the horror stories and anecdotes from people I know put me off of supermarket fuels). I tend to put Shell in it as it seems to be a bit quicker to respond, but I wouldn't be surprised if that was psychological (whereas on the Escort the actual figures show it isn't). Just shop around, see what works best if anything
Another can of worms entirely, but I do find differing consumption between the (95RON) fuel that I use even on my small engined cars. On the Escort, I get significantly better fuel consumption running BP than anything else. A consistent 4-6 mpg increase over anything else, over exactly the same journeys. About 10% difference, which makes it worth the extra 3p a litre. Texaco seemed to get a bit better mpg than the others I tried but not big enough of a difference like the BP, nothing that would sway me to sticking with Texaco garages.
However on the Astra it really doesn't make any difference to consumption what I put in (although rightly or wrongly, the horror stories and anecdotes from people I know put me off of supermarket fuels). I tend to put Shell in it as it seems to be a bit quicker to respond, but I wouldn't be surprised if that was psychological (whereas on the Escort the actual figures show it isn't). Just shop around, see what works best if anything
vit4 said:
However on the Astra it really doesn't make any difference to consumption what I put in (although rightly or wrongly, the horror stories and anecdotes from people I know put me off of supermarket fuels). I tend to put Shell in it as it seems to be a bit quicker to respond, but I wouldn't be surprised if that was psychological (whereas on the Escort the actual figures show it isn't). Just shop around, see what works best if anything
FWIW, Shell 95 octane ("FuelSave") returned by far the worst MPG figure out of all of the tanks of fuel I've put in my Picanto since I bought it.Supermarket fuel from various sources is between 6-12MPG better.
I've always taken the view with petrol to use what the manufacturer recommends as, if it needs or would benefit from 98/99 they'll know so would put it in the manual or on the filler (as Porsche do).
If they say to use 95, use 95, and depending on what sort of journeys you do maybe stick 1 tank in 4 or 5 of V-Power through it for the cleaning additives.
If they say to use 95, use 95, and depending on what sort of journeys you do maybe stick 1 tank in 4 or 5 of V-Power through it for the cleaning additives.
Thanks everyone.
I checked the fuel-filler flap this morning and it says use 95 Ron U/L.
Thinking back a few years to when I had an '07 2.5 n/a 4 cylinder Outback it didnt seem to like the 99 stuff .. guess the 6 cylinder bigger engines aren't any different
I'll run down the half-full tank of 99 stuff justnow and fill up with normal U/L and see what happens
Steve
I checked the fuel-filler flap this morning and it says use 95 Ron U/L.
Thinking back a few years to when I had an '07 2.5 n/a 4 cylinder Outback it didnt seem to like the 99 stuff .. guess the 6 cylinder bigger engines aren't any different
I'll run down the half-full tank of 99 stuff justnow and fill up with normal U/L and see what happens
Steve
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