Gasoline-Powered Cars Twice as Likely as Diesels to Fail UK’s MOT Emissions Tests, Study Finds

Recent MOT test data from the United Kingdom shows that excess exhaust emissions levels account for more than a quarter (26.2 percent) of all MOT failures. What’s more interesting is that, petrol (gasoline) cars more likely to fail meeting the required emissions standards (9.7 percent) than diesel-engined cars (3.9 percent).

So why is there such a big difference between petrol and diesel cars? “There are a number of possible explanations for the marked difference in MOT emissions failure rates between petrol and diesel cars,” explains Bruce Ellis, research and development manager at Redex, a maker of additive products that evaluated the data that is submitted to the Vehicle Operator and Services Agency (VOSA) by every MOT test facility in the UK.

“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,” Ellis says.

However, while these factors do make a difference, the biggest one is the MOT test itself, he adds.

“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 explains.

That may be happening now, but the future doesn’t sound so good for diesels.

Analyzed data covers 47.97 million MOT tests taken during the full year of 2010 and the first nine months of 2011.

By Dan Mihalascu

Copycats No More: Italian Court Recognizes Ferrari 250 GTO As A ‘Work Of Art’

As the 250 GTO is considered a work of art, it cannot be imitated or reproduced by anyone.

BMW Exec Says Diesel Engines Will Endure At Least Another 20 Years

The BMW chief technical officer also expects gasoline engines to survive some 30 years.

237 HP Skoda Kodiaq vRS Becomes UK Police’s Latest Pursuit Vehicle

The police version of the Kodiaq vRS features no mechanical upgrades compared to the standard vehicle.

Nissan Faces $40 Million Fine For Under-Reporting Ghosn’s Compensation

Japan’s Securities and Exchange Commission claims that this has had a big impact on investors’ decisions.

Mercedes-Benz Concludes First Tests Of Silver Arrow 01 Formula E Racer

Like Porsche, Mercedes will compete in the all-electric open-wheel series for the first time.

Out Of Control RV Goes Flying Into Departing Ferry, Driver Gets Killed

The driver is being praised a hero for honking his horn to alert people to get out of the way.

Guy Martin Drives A 1,000 HP Tractor To Record-Setting 103.6 MPH

The record for the fastest tractor was once held by Top Gear’s The Stig, but now it’s been blown out of the water .

2020 Genesis G80 Now Available In Australia With 311 HP V6, Two Trim Levels

Genesis’ luxury sedan has a comprehensive list of standard equipment and is priced from $69k AUE.

Hyundai Said To Be Planning Electric Compact SUV, Could Launch In 2021

The rumored EV will sit on a dedicated platform and slot above the Kona Electric in Hyundai’s range.

New BMW Z4 M40i Unleashes Its True Potential Courtesy Of G-Power

The German roadster now packs a mighty 493 hp and 516 lb-ft of torque.