[[email protected]]

Do i need to run on optimax every fillup ,
Also is the BP higher octain stuff any good ?

 

[rjbookes]

from reading previous threads different people have different views on Optimax and BP Ultimate, both do the job....each for their own i guess

 

[[email protected]]

I always use optimax, just because its the 98 ron and BP Ultimate is 97.

I doubt if it's gonna make a world of difference though.

 

[Bex]

I always use Optimax after an article Leonard read in EVO Magazine ages ago comparing fuels and it seemed to work (cleaning the engine etc) Plus I have so many Plus Points now that I am on for a personal driving session with Michael Schumacher :crackup:

Bex :angel:

 

[Leonard]

Plus I have so many Plus Points now that I am on for a personal driving session with Michael Winner :crackup:

Bex :angel:

Calm down dear its only a track day

 

[Bex]

Instead of being a T**t Leonard I thought you might have posted something about the EVO article and Optimax as that is what the thread is about!!!
Perhaps that would have been a bit too intelligent for you though

Bex :angel:

 

[oli goon]

the bp stuff seems to be stoopid money (i paid 97.9p in harrogate) whereas optimax is about the same price as diesel (90.9 in somerset).

most of the time you dont need 98 octane. probably 95 would do - but who wants to risk it.

 

[Razor]

The thing is, Shell Optimax is 98 RON but what is its MON value - RON testing is based on part throttle tests but MON testing is based on a full throttle (which is what we EVO owners tend to prefer ) - and there is no direct correlation between RON and MON in some instances.

Obviously the MON will be lower than the RON for optimax but does anyone actually know the value and if so, can they bring up a comparison chart between Optimax and other petrols such as Esso SUL, BP Ultimate etc?

Maybe this is worth a thread on its own?

 

[chunky]

I think AndyF has been though this before, Ultimate (and I think any SUL) has a higher MON value than Optimax, if we were Yanks using R+M/2 then Ultimate would have a higher pump octane rating than Optimax. Remember, Optimax, for all it's fabled '98.6+ RON', is only graded as NUL, not SUL.

I'm happy using anything, although the price difference between Optimax and Ultimate/Esso SUL usually means I end up on a Shell forecourt. Yes, I am a stingy *******

I do recall back in the day when Optimax first came out that I immediately noticed better pickup and power with it, but nowadays I can't say I feel any benefit. The cynical part of me says that the first 6 months or so of production at Stanlow were ever so slightly tweaked to garner a reputation that seems to hold to this day!

 

[Razor]

Thats quite interesting, I wonder if there are any published figures (or figures than can be supplied) of the MON of different fuels. As an interesting aside, the 'shell expert' (ho ho) strictly stated that Optimax was not a NUL with additive added but the 98.X + petrol was refined at base but that it was possible for the quality of the petrol to degrade over time (but the guy stated over a 2+ year period). He also said that it didnt take the relevant BSxxxx test as they decided it would far exceed the test and therefore no reason to do so (hence the NUL rating)..

When Andy pressed about this though they brought out the old chestnut.. 'I'm sorry I can not tell you any more as it impeaches on commercially sensitive information...' sort of line.

As you say though, the conversation is pure academic because as it turns out - optimax is normally the cheapest.