Quote:
Originally Posted by gpick24
I have an old banger i`ve been doing up over the past few months, and it has had some performance issues (low compression on one cylinder) and it used to struggle when going up hill, the slight incline on the motorway from Accy to guide I would have to drop down to 4th to manage 60, I tried BP ultimate unleaded and the performance increase was very noticeable, managed the same stretch of motorway at 70mph in 5th gear.
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What car is it and how old is it? If it's a pre unleaded vehicle a lot of them lost power and needed timing adjusting to cope with the lower octane rating on unleaded petrol. These so called super petrols have a higher octane rating so it might just be running how it was supposed to.