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Shell has announced the launch of a new engine oil which it claims reduces fuel consumption by up to 2.2% per annum. The oil, called Helix Ultra E, is a synthetic low viscosity motor oil aimed at reducing friction more effectively than conventional mineral oils. Shell also claims that it can cut a car’s carbon emissions by up to 72kg of CO2 per annum. By Graham Hill

I have received a couple of words of warning about topping your oil up. The first is probably fairly obvious, make sure that the car is on flat ground when you check it. It may seem obvious but in cars where electronic sensors are fitted drivers often forget that when the level is checked the car still needs to be on flat ground. But the lesser known piece of advice is not to overfill the engine with oil. This is especially important with diesels as the oil can find its way into the exhaust and damage the particulate filter which can be very expensive to replace and would not be covered by the warranty. By Graham Hill