5.7ltr SS - premium unleaded v unleaded???

[VZ SS :D]

Just bought a VZ 5.7ltr SS pretty sure the bloke before me didn't run premium. Should I?? How much does it affect; Economy? Power? Better for engine? etc.

[LowVZ]

i know this off track,
but i run 98 octance in my v6 all the time.
runs alot better on it.

My dad runs 98, in his VX SS, same thing. Goes harder

[VZ SS :D]

Worth the extra $$?

[alien]

I reckon extra is. My L67 loves Mobil 8000 fuel. Even increased my throttle response over other fuels And helps keep the engine clean Burns better too. That and a CAI is all i did to get a 0-100 time of roughly 7 seconds (still yet to actually time it again and get exact figures).

[VZ SS :D]

Any other advice??

[johnvtls1]

yeh i run nothing but 98. you will get away with the standard stuff but i think the manual says 95 is minimum? not 100% sure on that so dont quote me. for the average car it shouldnt really matter, but once the car is tuned for 98 it will only work well with 98.

[DanVN]

i Run 98 75% of the time, usually switch it up every 3rd time and use normal unleaded.. seems to get more mileage out of the normal and premium tanks when i do it.

[Drewie]

I run 98 in my VX SS which is stock apart from a cat back exhaust, I mainly run it for the supposedly cleaner burning, the detergent package is supposedly meant to keep the injectors etc cleaner. My VX runs great on it, but I have been in the country where 98 has not been available and thrown in the odd take of 91 or 95 and had no dramas.
With the VX V8 the recommendation in the Holden handbook is 91 octane.

[LowVZ]

Yeah id defo be using it every third tank or so.
just to clean it out if u cant be botherd or afford it every time.

[Lumps of cheese]

I run nothing but 98 in mine but it's been tuned so to get the best out of it i run the 98. Beforehand i ran 95 without any probs and the economy was pretty good.

[SimoVXSS]

98 is all i use, didnt matter what the car was.

Its a cleaner fuel, burns more effeciently and better for your engine. Worth the extra $3-$5 IMO

[VZ SS :D]

Well gone through a few tanks of both 98 and 91 fuel and to be honest i cant tell any difference, maybe a little in kms/tank but might just be from different driving.

[CANYONERO]

i only run mobil 8000 or BP ultimate in the Vy, there the only fuels i use in it unless i go back home ( small country town) with a liberty or shell. so i only put in enough to get me to the nearest BP and fill up. i think its worth the bit more but usually my car sits in the shed most of the week and only used on weekends, i got gas in my daily for the grind to work an i put in whats easiet to get.

[Lumps of cheese]

Well gone through a few tanks of both 98 and 91 fuel and to be honest i cant tell any difference, maybe a little in kms/tank but might just be from different driving.

Has it been tuned?
You won't really notice the difference until your car has been tuned. Most tunes are set up to run specifically on 98 or in some case 95. Since my tune i've ran 98 all the time and the difference in economy and proformance is quite noticable.

[VZ SS :D]

Na not yet, I plan to get one though

[cpbait]

the difference between 91 and 98 is about 3% in power difference and economy, they are set up to run both from factory, obviously 98 will be a bit better, this is what i was told and shown on a efi performance course i did, i personally use 98 about 99% of the time, have put 91 in to see the difference and for the extra couple of dollars the 98 is worth it, i got better economy and felt better out of it, have used 95 before and didn't notice a real difference between 95 and 98.

i use shell 98 and if just a little top up will put 91 in, have just put carltex 98 in this week.

my trade school teacher said you can use 91 during the week and will be fine and put 98 in on the weekend for a bit of fun

[Brail]

I have run a two month test on this very topic using 95 for a month and then using 98 for the following month. My car hasn't been tuned specifically for either fuel and what i found was that for the price difference in the fuel compared to the difference in mileage gained from the higher octane fuel the difference is very very small. 98 won the battle but you could really call it a tie. I quess it comes down to having the benefits of cleaner burning fuel and less engine wear from the 98.

[rb26dett]

Just use regular unleaded until you get the tune.

[coolvxss]

My car is stock, and have tried both fuels and cant notice a difference

[DevilDRake]

My shitty 1997 Hyundai excel sprint, after going from 91 to 95, it makes a pretty noticeable difference.

[Dr.304]

I will not be using anything more then 95 octane when i feel like it.
Other than that 91 octane here i come!!

Ive owned too many cars where 98 octane is a must!

[CommVTS]

The bloke that's dyno tuning my car says to always run 98.

[wrx884]

i Run 98 75% of the time, usually switch it up every 3rd time and use normal unleaded.. seems to get more mileage out of the normal and premium tanks when i do it.

ive been doin exactly this and 2 my supprise ive been gettin more mileage out of normal unleaded aswell. only noticed this over the last few months tho wen i decided 2 try 91 4 a change.

[blow thru]

You want to run through a couple of tanks of 98 to benifit from the higher octane as the pcm will relearn itself to adjust.As for goin from 91-98 in price difference just forget the bottle of coke an mars bar an then its the same price. win win situation

[JD]

Really depends on the car, for all the V8's i've owned, i've always ran 98 ( or 95 in extreme cases when 98 was not available ) but with all my 4 or 6's never bothered with it because they were runabouts anyway.