Which fuel???

[RT/10Dave]

Another question... Which fuel is the best to run the beast on?
Who uses what? Supplier? Type?
Not sure which one to use...

[V1PER]

BP Ultimate and never had any issues
Alot of people use Shell Optimax as well
But should also be OK on Regular Unleaded on a stock car

[Viper]

I stick any well known brand in no problem, sometimes just 95 oct, if passing ill drop in a few tanks of optimax to clean things up

read an article test where x4 60K mile cars ran the same fuel for months, engineers then stripped the x4 engines down for a look, a couple of the less well built engines had build up, then put them back together and ran through a 1000 miles of optimax then stripped them down again,
the additives in the optimax had removed the build up

[RT/10Dave]

I have a BP garage about two miles from my house, which is pretty well on the way to everywhere, (between me and the motorway) but unfortunately I think the closest Shell garage is a good 8 miles or so away, and rather out of the way... I'll give the BP a go and see how I get on...

Is there an octane level I should aim to stay above?

[viper nigel]

Dave,

I've used BP or Tesco regular unleaded most of the 6 years I've had my RT/10. Occasionally every 2-3 months I fill up with something like Optimax or the higher octane unleaded fuel but I've never had any problems.

Nigel

[xyyman]

In the UK i run the SRT 10 on 95 octane. Took it over to France and treated it to 98 octane (much cheaper over there) and it made no noticeable difference. According to the factory handbook they are built to run on 93 octane.

Phil

[Viper]

xyyman said:

In the UK i run the SRT 10 on 95 octane. Took it over to France and treated it to 98 octane (much cheaper over there) and it made no noticeable difference. According to the factory handbook they are built to run on 93 octane.

Phil

your handbook is a Dodge import, you cant get 93 here
For some reason the US octane rating is different to ours, their 93 is
equilivant our 95 (or is it 97 ? cant remember)

[ViperScot]

The US octane rating is not comparable to ours. They use (mon+ron)/2 rather than us using ron. Their 93 octane is roughly equivalent to our 95.

[zed sump]

94 or 95 RON would be fine for a stock compression ratio of 9.6:1
no performance advantage achieved by putting in higher figure RON fuel.
higher compression ratio engine will require higher RON fuel to resist abnormal combustion processes in the cylinders - pre-ignition etc (knocking sound)
98 RON is good for 10.2-10.5:1 C/R