There is a discussion over on Toymods about the above topic. I contributed some info which may be of interest here too.

All the new "Named" premium fuels not only have a higher RON but also have a higher DENSITY. This means greater energy per unit volume thus you could develop more power for the same throttle opening or alternatively more economy

for the same power output as regular ULP. Last year I surveyed these fuels and found the following densities. Some have these figure on their web sites others responed to email questions. I expect all could be changed without notice.

 

This predated the Vortex98 release.

 

Shell ULP 0.735 Optimax 0.76

Mobil 2000 0.72 8000 0.76

BP ULP 0.735 Ultimate 0.755

Caltex ULP 0.74 Vortex 0.75 (95RON)

 

This indicates that Caltex has the better ULP and Shell and Mobil the better 98

 

Cheers,

Barry

well, mobil's out of the race straight up, because it's only sold by a few outlets in capital cities. |blink|

 

do some road testing with the different fuels. my ex and i drove from ballina to coffs harbour, and used 3/4 tank of caltex vortex. we drove around coffs on holiday for a week to empty the tank, and filled up with optimax down there. we used 1/4 tank on the way back. caltex? :fuzz:

 

if you look into optimax, it's not that good either. its chemical composition doesn't allow it to mix very well with other oil-based substances, such as oil or other brands of petrol. so if you're stuck without a shell station and you fill up with something else, parts of the petrol separate and you end up with a clear goo in your entire fuel system. i've had mates who this has happened to

 

speak to any rotary enthusiast or person who uses 2 stroke (gokarters, dirtbikers) and they'll tell you how crap optimax is at mixing with 2 stroke oil mix, and how it's a good way to burn deposits onto the inside of your engine and end its life prematurely. optimax also has over double the minimum amount of ethanol than ultimate ;)

 

bp ultimate is the only epa-approved emissions reducing fuel in the country :(( it has the lowest ethanol reading of all petrols :blinks: it's able to be mixed with other fuels in an emergency :danger: bp are also australia's biggest pennzoil reseller, and i reckon pennzoil is one of the best oils in the world :dance: good brand names usually stick together

 

i'd stick with bp ultimate. a few BTUs more energy isn't going to make a difference if you're getting crap fuel economy or prematurely ending the life of your engine

I agree with Jamie on that one. I always use BP Ultimate and never have problems with it. I have also used Ampol Gold in the past. I found this to be a good fuel as well.

I don't know too much about the technical stuff, but i know that Shell Craptimax is just that. I had nothing but trouble with it the first few times i used it. Maybe it was just a coincidence that my car didnt want to behave that week, but i didnt see any need to risk using Shell again.

all fuel except challenge is the same here.... no matter what brand! just a few different aditives so makes no difference to us :dry:

i agree with jamie, ultimate is the best, we've tried all the others.

 

from a motorsport point of view, we only use BP ultimate, everything else(a part from ELF) is shit for rallying(when i say motorsport i mean anything that is governed by cams).

 

 

BRING BACK AVGAS!!!!!

bring to move servo's the 102 octane we get at 1 service station in sydney....

 

thats DA BOMB! :((

ampol is caltex with a different brand name, they use the same supplier. my work has caltex starcard, i have a retailer listing for the main supplier in my area (northern marketing) which lists anywhere i can buy fuel

all ampol servo's names will be changed to caltex servo's soon.

 

I find mobil 8000 makes the mr2 run better then the other fuels but in the town I'm in i can only get optimax or ultimate. So the mr2 usually ends up with ultimate fuel.

Ive only just started driving on optimax but a mate found optimax was better in his vl commodore than the bp stuff but ill be sure to try em all

damn petrol is so expensive now

pfft, i bought ultimate up there on the way to all toyota day, and it's like 103.9. down here the cheapest ultimate i can get is 120.9 :(( our normal unleaded is like 114.9

our 96 is 123.9 :dry:

I can't bring myself to pay over $1.20 a litre for premium. I just can't do it :((

 

Ive had to about two or three times since being in sydney though :blinks:

 

average price i pay over a 6 month period would be about $1.10 i reckon.

need a carby rebuild kit nick? or a new carby ?

 

Weber maybe? - anything is better than that fuel consump atm...

Ooooooo, I really started something here. I did'nt realise that there is such passion in the fuel scene nor did I know the detrimental effects some fuel have on engines.

Thanks SuperJamie.

 

I often wonder where the companies get their fuel seeing that in Sydney at least there only two refineries Caltex and Shell. and other cities only one refinery. So where do Mobil and BP source their fuels? Are they simply rebranded Caltex or Shell or do they ship it is from their own refinery interstate or offshore? Does anyone know???

 

Cheers,

Barry

perhaps not so much where it's refined, but how it's refined, or to what purity, or what additives are blended with the base product later on

 

it is rumored that optimax does what it does because it's base unleaded with additives, and the additives are what causes separation. some other fuels don't do this as they are more highly refined mixes from the word go. i don't know how true this is, and i don't know enough about petrochemical science to prove or deny it