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LeMans winner Johnny O'Connell answers your driving questions

The guy's been racing professionally since 1987. He's won at LeMans four times. He's used to success, but this week he's an instructor at Bondurant, trying to make a halfway decent driver out of your humble editor.

Petrol cars twice as likely to fail MOT on emissions

The latest MOT test data shows that 26.2% of all cars tested fail on excess exhaust emissions – and surprisingly petrol cars fail more than twice as often as diesels in this part of the annual roadworthiness test. According to the official Vehicle Operator and Standard Agency (VOSA) figures, which cover all of 2010 and the first nine months of 2011, 9.7% of petrol cars failed to meet MOT emissions standards compared to just 3.9% of diesels. On Bing: see pictures of the MOT test Find out how much a used car with 12 months MOT costs on Auto Trader The analysis has been carried out by fuel additive “provider” Redex, which naturally has an interest in the findings, since its products are designed to breakdown engine deposits and improve efficiency.

This 108-year-old Mercedes Simplex could sell for £900k

‘Old Mercedes up for auction’ doesn’t quite do this magnificent automobile justice. It’s a 1905 Mercedes Simplex 28/32 Phaeton, and one of the oldest Mercedes still in existence. But this car does not merely exist – it is resplendent as a stunning example of the very best the Edwardian era of motoring had to offer.