Leaded Petrol

[Hoover33]

I have been running my car on BP Ultimate (or what ever it is called), and I went into our local ESSO petrol station this morning to fill up the company car and I noticed they sell LEADED 4 STAR petrol.

From what I can recall the bloke I bought the car from said it had been adjusted to run on unleaeded.

Will my S2 run better on this......opinions and thaughts please ??????

[bugsy]

That'l be the LRP, which as I understand means it has the chemical added to protect the softer valve seats on the older engines.
Our 2.9 engines apparantly do not need this but do like the better octaine in the super unleaded and ulimate type fuels.

I have no doubt that if I have missread the previous postings that somebody will correct me.

[Roy C]

It depends on how your S is set up to run. I've always used unleaded, but I've tried 4star, Optimax, etc and it makes no difference whatever (apart from some minor credit card damage).

[Andrew Noakes]

If it's correctly set up to run on normal unleaded - 95 octane - then using anything with a higher octane rating is a complete waste of money. Will have no positive effect at all. The only cars it will benefit are those with engine management systems which can adjust ignition timing on the fly to suit the better fuel.

LRP won't do anything useful if your engine can accept unleaded.

Leaded four-star is still available, though you're unlikely to see it at an Esso station - but again, it won't be any better in an engine which happily accepts unleaded.

[UKBoB]

Someone once told me buying the higher octane super unleaded fuels does cost more, but with the greater fuel efficiency will return an equal value as the 95ron fuels in mpg. Does this hold any/much truth?

[Andrew Noakes]

Only if the ignition system has some sort of knock-sensing ability and can adjust itself to match the fuel being used. Then, if you use higher-octane fuel the system advances the spark a bit and you can get better efficiency.

[Hoover33]

Right ..... points noted....

Just for the record though....in case anyone wants to know...

Lisles at Knebworth on the London Road sells 4 Star Petrol (not LRP).

I only occasionly go there dispite being 500 metre from my house. On an other forum I found a list of garages that sold 4 star, so out of interest i looked up my local one. My initial thaught was nahhhhhh they've got it wrong it must be old info...but I actually went and looked and the web site was right.

[Ali B]

if you have a catalytic converter, leaded or lrp will destroy it.
expensive mistake.