Hi all.

I do apologise if this thread is in the wrong location but im new here but hello to you good folk.
I hope someone can answer my question.

Just bought my First Subaru Impreza Sti last week...great buy and awesome car.
My issue is this..normally running on Shell Vpower i was caught short and like a plank i put about £10 worth of 97 octane fuel in the tank (supreme unleaded) when it was running low but realising after i read this is not good for engine and can blow it worst case.
Next day i filled the tank with shell Vpower and driven it like a pansy sinse..how long do i need to do this for? I dont want to destroy the engine but would like to enjoy the power etc.

Cheers guys.

 

Just take it steady until your next fill up then you'll be fine chap.

 

I think you should be ok to drive it normal mate, a full tank of vpower will easily dilute around 7 litres of 97ron, oh and welcome to scoobynet;-)

 

Thanks for the quick reply.
I forgot to mention it has a remap which i believe is for 99 ron. Will adding the Vpower counter the 97 supreme or should i run the full tank off using no boost at all just to be safe.....a lesson learned i think ha.

 

As above, a tenners worth of 97 will probably be as good as cancelled out if you refuelled with say £40 worth of V.

Welcome to sn mate

 

Sorry to hijack the thread mate but since I've had mine I've run it on tesco momentum simply because the nearest shell garage to me is about 25 miles away and the person who owned the car before me I think has run it on normal unleaded (found receipts when cleaning out the car for the first time) and my car seems to be fine mate, I'm sure most people on here use shell v power but no way am I driving a round trip of 50 miles to fill up, I'm sure you'll be fine

 

Thanks mate.
I filled it costing nearly £60. I spoke to a couple of Subaru specialists and the they said i could det the engine which means a rebuild Running a full tank off boost is going to be
Tough lol.
Many thanks.

 

Dan the tesco momentum stuff has a 99 rating same as V so probably just as good anyway

 

You should fine the knock sensor will do its job should the car start pinking. I've run mine on 97 and it's been fine.

 

Thanks for the comment mate.
Is your car running standard or with a remap etc? Mine has a remap which i think was setup just for 99 ron. Mine is a 2005 Sti not sure how other years would cope with the different fuel types.

 

That's ok mate, mines not been remapped (yet) and is completely standard so could possibly make a difference, mines also only a 2001 wrx,but I'm sure you will be fine.

 

Ive bought 4 new ones and everyone has come with a tankfull of standard unleaded

 

I ran mine once on 97 from Scarborough to darlington once on that 97 all way fine

 

I have run my turbo 2000 for going on 5 years on normal
unleaded and its fine.

 

It will be fine

 

This is the very reason why I'm glad to be out of Subaru ownership.
Needing to have angel tear fuel available all the time.

It'll be fine big fella

 

I've had my STI mapped to 99 Octane and tracked it at Brands on 97.
Wouldn't worry about it mate.
Just take it a bit easy if you are that concerned about it.

 

Will do mate.
Its what you read that makes you worry. When i spoke to a couple of garages they were making it out as if i had put a bomb under the bonnet ha. It does seem extreme that a slightly lower octane can destroy an engine but im so new to this i wouldnt want to take the chance.

 

The engines have a knock sensor that will de-tune the engine if the octane is too low for the running conditions.
Wouldn't make a regular thing of it though.
ps. 5 posts - you are an expert by now.

 

Im sure it will cope with a few litres of 97RON in it.

 

Could you name the suabru spicalists that tile you that ? Just so we all know not to use them ! Lol

 

If the said garages told him it'll be fine and it blew up how would they look then ??

The advice they gave him was fine, if a little exaggerated. Running your car very hard on poor fuel for long periods can do damage. The garage was just being over the top safe which
Isn't a bad thing.

Op, if your car is mapped for 99ron fuel then thats the fuel you should use. The odd bit of lower ron fuel will be fine if driven steady but I personally wouldn't recommend you using it all the time.

 

You mean it hasn't blown up...yet.
Please don't give this sort of unhelpful comment on a forum where many people know better.
First the guy said it's mapped for 99.
Second, unless your car is specifically mapped for '95 octane then if you're running fuel with a lower octane rating than the engine map caters for, then whilst the ECU and various sensors will retard the timing of the car to an extent, it's not a foolproof mechanism and to run it on '95 for a prolonged period is simply going to increase the wear on the engine and likely cause other parts to fail in the long term.

In short - use the fuel the car was designed for.
After all, what's the point in buying a performance car and then putting fuel in it which will degrade the performance and health of the car. You might as well through money down the drain, all for the sake of a few quid on each fill up...

 

If it was going to blow up I think it would have done it
by now don't you?

I have never had a problem with the engine in my five years
of owning it and its now on 137k miles.

I can understand your point if the car is modded/mapped
but mine isn't, and like I say it runs just fine.

 

Exactly !

Welcome op, and I'm pleased that you've had the nous to ask a question.
Oh - and to be give the (correct) advice of fellow enthusiasts.

You'll have the machine for years. Don't worry M8 !