Advice on petrol

[gibby]

Just been reading a few threads around about super unleaded etc and wanted to know if anyone can answer this, I'm currently running my cab on optimax and my question is, is it worth it for me ? I can see the benifits to valvers etc but mines 8v k-jet and I can't say that I've noticed any difference between running optimax for the last four months or so. Could I even be doing damage running on a higher RON or should I keep with the optimax ? 

Thanks in advance. 

[Dizzie]

I gave up using that and went back to normal stuff. I tend to only use my car to get to work now so not really any advantage in spending the bit more on the 98 stuff.

my advice is go back to 95RON and save some money like me

[gibby]

That's what I'm thinking Diz. Anyone else any views or thoughts on this ? 

[JMallows]

YEah, i'd stick with the cheap stuff myself. I'm going to guess that your car has been run on "normal" fuel all it's life?? Well, why break the habit, unless theres something wrong??

[rubjonny]

Apparently Esso Premium 97 is the best, followed by BP Ultimate then Optimax.  The theory is that with a better fuel the engine doesn't have to work as hard at any given time because the fuel burns better, therefore making it run more efficiently and making up for the extra cost.

In real life it depends on the engine I suppose, just don't use supermarket fuel that stuff is nasty, often full of all kinds of crap even sand in one case!

[Veedubgt18v]

the only way i have been able to stop my car making a misfiring thing at motorway speeds is to use 97ron+ so its lrp, super or whatever but not norml for me!

[hairyarse]

I don't know if same applies to the cab, but MK1 gti was originally set-up for 97 RON (4-star) if i recall right. Mine certainly runs better on Optimax. However, a lot of cars over the years have been 're-tuned' to run on 95 RON unleaded.  Therefore, if this is the case with your engine then running a higher octane rating wouldn't make any real difference.

[Len]

The RON rating is a measure of how powerful the fuel is or rather how pure.
The higher the rating the bigger the bang - simple!

In reality i find Tesco's the best and cheapest. I have used Opitmax and othe Super unleaded's but dont feel any difference. Wont use Sainsburys - thats crap!

[Len]

There are two things that govern the efficiency of an engine.

1.  The drag caused by the friction of metals and compliance of springs etc.

2. The flow of air/fuel thro the engine.

Fuel only makes a bigger or smaller bang. Nothing else.
Now if ya wanna talk about the crap additives the put in nowadays, then give me the old Leaded 4* any day!

[VeeDubGTI16v]

optimax cleans the injectors too