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Re: premium, super unleaded or lead replacement? (archive)

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Posted by Stevie on July 04, 2000 at 14:43:09:

In Reply to: premium, super unleaded or lead replacement? posted by Darren I on July 04, 2000 at 13:34:58:

: I have an '88 m3 & have removed the cats,( still retaining the lambda sensor), and was wondering what grade of fuel you guys run? here in the uk we have a choice of premium unleaded (95 octane ) super unleaded (97 octane) or lead replacement petrol (not sure of the rating). I currently use premium unleaded as it's a lot cheaper , but was wondering if switching to a higher octane rating offers any performance advantage?, or is it just a waste of money?
: thanks for any help/ advice.
: Darren.

Hi Darren,
I currently run an Evo 11 M3 which I've had for around 6 months, when I first got the car I ran it on super unleaded but after a couple of months at 250+ miles a week I found the cost a wee bit on the expensive side so being a tight Scotsman I thought I would try premium unleaded for a week or two and see if the car ran ok which it did no pinking or missing etc. That's been around 4 months on premium and she stills runs perfect! Super unleaded offers a tiny performance advantage but nothing to write home about and if your not flogging your M3 everywhere premium is fine. Hope this helps.

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