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Taken to the cleaners

Could you please expand on your apparently disparaging reference to supermarket petrol as a contributory cause of lambda sensor failure?

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It does not keep the car's fuel system as clean as fuel with the additive package of Shell V-Power, which is the best fuel you can buy and virtually guarantees no fuel system problems from carbon deposits (as well as slightly increased power and a better burn at low revs which, if utilised, improves fuel economy).
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You mention that supermarket petrol can clog up engines and reduce MPG from the deposits in their additives. I understand that it's best to use branded super unleaded. Is it the case that branded normal...
Is Shell V Power any use?
In your column on Saturday, October 8th you made mention of supermarket petrol. What is wrong with it? And is diesel affected as well?
 

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