Petrol Cars More Likely To Fail MOT Due To Emissions?

Redex, the UK’s number one fuel additive provider, has conducted some research into the causes of MOT failure. Apparently, petrol cars are much more likely to fail on emissions. More than double the number failed a test as compared to diesel engines.

Bruce Ellis, research and development manager at Redex, said: “There are a number of possible explanations for the marked difference in MOT emissions failure rates between petrol and diesel cars. These include the different driving cycles that traditionally are undertaken. Namely, petrol cars are more likely than diesels to be chosen for frequent shorter, urban trips, whereas diesels are more likely to be chosen if the vehicle is to be commonly used for longer, motorway-based journeys. Also, diesels operate at lower engine speeds and are therefore a little less stressed than higher revving petrol motors.”

“But the most obvious explanation is likely to be the MOT test itself. Petrol cars are assessed for a high number of gases and hydrocarbons in the exhaust emissions, while diesels are tested only for smoke levels. This means that relatively speaking, diesels probably have an easier emissions test than petrol-engined cars.”

Ellis adds, “For modern as well as older cars – petrol or diesel – regular use of a quality fuel system additive like Redex reduces carbonaceous deposits that can restrict the flow of fuel through an engine’s injectors. Blocked injectors can reduce the efficiency of combustion, leading to increased exhaust emissions. Obstructed fuel systems can also increase fuel consumption, so using Redex can save fuel, too.”

Maintaining performance and efficiency, Redex fuel additives are proven to reduce exhaust emissions to optimum levels whilst restoring up to 20 per cent of engine power, improving performance and increasing fuel economy.

Have you used Redex in the past and if so what results did you find?