pippyrips

apart from the obvious dilution does it matter if you top up your fuel tank with super unleaded when there is half a tank of optimax in it already
i.e.
does it effect the running of the engine in anyway other than less power??

chris's scooby

That's very brave of you posting the suggesting the idea that you could put something in your car other than Optimax!

Expect to be lynched soon.

ThrustSSC

No, you'll be just fine. Your engine management system constantly monitors the engine and adjusts according to how it behaves on the fuel and air it's getting.

chris's scooby

Sorry, i forgot to add anything helpful into my eariler post, so here goes! I've done in lots of times in the past. 34000 miles in a MY02 WRX and no problems.

cong

stuck about 10 quid of normal unleaded till i could find some super or optimax, then whan i found some optimax i stuck in £30, on the way up on the a1 i was having a quick blast against a bugeyeye but the knock link was going mad everytime on WOT, so i had to back off, my cars a uk spec with light mods only but the knocklink lit up red which has never happend only when i mixed the fuel, so may i suggest dont mix unleaded and optimax/super until the unleaded has been used up

William from Briskoda

Well my Octy vRS runs just fine on 95RON, can't say I have ever noticed a difference with these special petrols other than the hurt to my bank balance. Tesco unleaded for me.

AndyC_772

iTrader: (2)

That's because you're not driving an Impreza! The scooby engine IS fussy and most definitely does react badly to poor grade fuels.

Gear Head

iTrader: (2)

Mica Blue

What does WOT stand for??

AndyC_772

iTrader: (2)

Wide Open Throttle

Gutmann pug

You will most certainly burn in hell for putting anything other than optimax in your car.

STi Paul

Gutmann pug LOL You forgot the smilies

Paul

Gutmann pug

I would have put them put i meant every word of it ....... its blasphamy surely

waggy doo

iTrader: (1)

I have a MY96wrx with a dyno'd figure of 307bhp have had it for just over 3 1/2 yrs and at least once a week i put normal unleaded in it,because i cant be arsed to drive to my nearest shell.
Well here goes- about to tempt fate big time! It hasnt missed a beat yet.
It seems to me all bloody scoobs are diferent.
I mean some people on here have run classic sti's on super for years with no probs were'as others have blown theres up because they put normal super in.
Why the hell is this.
I love my scoob to bits but always have that nervy niggle in my head everytime i open it up.
Hands up any1 that drives there scooby without looking at the various gauges and listening to the note of the engine every other minute just to check everythings ok.
It really gets on ur **** after a couple of years.
Still bloody love it though.

captain ted

I run mine on only normal unleaded as there are no Shell garages near me.

Its today had its 30k service, been plugged into the computer, fully checked over and no faults were found at all. Go figure?

AndyC_772

iTrader: (2)

The computer won't log premature bearing wear - the first you'll know is a loud knocking from the bottom of the engine.

Many UK cars (Turbo 2000 / WRX) should be able to run on normal unleaded without damage, but most owners seem to prefer SUL anyway, both as a precaution and because it gives better performance. Not sure about the STI.

Mica Blue

Cheers fella..

Mitchy260

I read an interesting article about optimax and SUL

Optimax is a lower grade fuel with additives to make it 98 ron.
SUL is pure 97 Ron

An optimax used engine was stripped down after x amount of miles and this additive coated everything

Don't know whether this is true or not. I use SUL and optimax, just what ever is available at the time.

Rioja

Does anyone think this has an impact on piston slap? I've run my UK spec turbo on normal unleaded for 7 years from new. Performance is good, but piston slap from cold is a bit annoying.
Funny how you get the car new and it's, 'Bloody hell, this is quick!' to 7 years later being, 'come on you bitch, come on!'