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Paul di Resta returns to DTM with Mercedes

Some drivers manage to make the transition from one form of motor racing into another, and some run into trouble. Take Paul di Resta, for example. The promising young Scottish driver dominated Formula 3 racing in Europe in 2006, then moved over to Germany's hugely competitive DTM touring car series where he finished second in 2008, third in 2009 and first in 2010. But things didn't go as smoothly for Paul - cousin to retired Indy champion Dario Franchitti - when he moved in to Formula One with the Force India team.
In three years on the grid, he failed to score a single podium finish. Little surprise, then, that Force India opted not to renew his contract for this season. Left without a ride, di Resta is now going back to DTM with longtime supporter Mercedes-Benz, testing the new C-Class touring car today in Portugal. It's good news for Mercedes, which is celebrating 120 years in motor racing this season and, with 2005 champion Gary Paffett also on board, can now count two former champions on its DTM roster.
We wouldn't count Paul out of F1 for good, though. When he won the DTM title four years ago, he was also moonlighting as Force India's test driver, and we wouldn't be surprised to see him pull similar double-duty with the Mercedes F1 team (or another Benz-powered outfit) this year before spring-boarding back into grand prix racing in the future. At 27 years old, he may not have been the youngest driver on the grid this year, but he's still got a good few years ahead of him.

VW joins Daimler's protest of new A/C refrigerant as EU deadline for compliance passes

The case of Dupont and Honeywell's refrigerant R-1234yf is doing the exact opposite of keeping things cool. The two chemical companies have spent years and hundreds of millions of dollars developing R-1234yf to replace R-134a, the new refrigerant shown to be 99.7-percent kinder to the environment than the one it is meant to succeed. Part of that development has been years of testing by governments, outside safety agencies and automakers to approve the chemical for use in cars. It passed the protocols necessary for the European Union to declare that new and significantly revised cars from 2013 onward needed to use R-1234yf, and mandated that every car as of 2017 must use it.
Enter Daimler AG. The automaker created a head-on collision test with a B-Class at their Sindelfingen test track that would lead to the pressurized refrigerant being sprayed on the engine. The result in 20 out of 20 test was that the refrigerant burst into flames as soon as it hit the hot engine, while Daimler says that R-134a does not catch fire in the same test. Another unexpected result of the R-1234yf test was the release of hydrogen flouride, a chemical far more deadly to humans than hydrogen cyanide, emitted in such amounts that it that turned the windshield white as it began to eat into the glass.
Said a Daimler engineer in a Reuters piece, "It was scarcely believable. The most complicated lab tests conducted using the most sensitive measuring instruments around found nothing and all we do is drive a car around a couple of times, open a tiny hole in the refrigerant line and the next thing you know the car is on fire." So Daimler said it wouldn't use the refrigerant, and it recalled the cars it had already shipped with R-1234yf.

Mercedes CLA45 AMG Racing is ready for a spot on the grid

Mercedes-Benz trotted out its CLA45 AMG-based racer at the 2013 Frankfurt Motor Show. We first showed you the sedan in the deluge of news and reveals that precedes most good auto shows, and were blown away by the car, formally known as the CLA45 AMG Racing Series.
We were strolling by the Mercedes stand, and figured we'd pop in and take a look at the new racer and its carbon-fiber body panels, gutted interior, and race-sourced aero parts. It's a looker, both as a road car and a track weapon. It's not clear what series the CLA45 AMG will qualify for, although it does seem like a shoe-in for the World Touring Car Championship. Let us know what you think of the CLA racer down in the comments. In the meantime, we've got a full gallery of live images up top, along with the stock images that were posted last week on the Mercedes-Benz Facebook page.