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BMW Z5 roadster gets frosty in winter testing

The successor to the BMW Z4 (remember that thing?) is currently undergoing testing in what may be the least hospitable place for a two-seat roadster – northern Sweden. Yep, even sunshine-loving convertibles need to undergo winter testing. We still aren't 100-percent certain of the name, but rumors are pointing to BMW ditching the Z4 nomenclature in favor of Z5. As we've reported before, it's very likely that this car is being developed with help from Toyota. The platform underpinning the car shown here could become the long-awaited new Supra (albeit in hardtop-only form). We'd love to tell you about the look of this new car, but between the camouflage and the caked-on snow, it's hard to draw a bead. We can clearly see the headlights are inspired by newer BMWs like the 7 Series and 2 Series, but other details are harder to discern. The right elements are here, though. The prototype has a long hood and short rear deck. It's also worth pointing out that the car shown here marks a return to a canvas convertible roof. Aside from being less complex, our spies report that the soft top is being used to lower weight and provide sharper handling. While our report on the Z4's successor from March 2015 pointed to a 2020 launch date for the new roadster, our spies say the German part of this BMW/Toyota partnership could launch in late 2017 or early 2018 with four- and six-cylinder engine options. Related Video: Featured Gallery BMW Z5: Spy Shots Image Credit: CarPix Spy Photos BMW Toyota Convertible Performance bmw z5

Mini Cooper SE Convertible wheels made entirely from recycled aluminum

Mini has revealed an interesting fact about its limited-run Mini Cooper SE Convertible: It's the first production car with wheels made from 100% recycled aluminum. Despite sharing the same look as wheels available on the regular SE hatch, they're actually much more environmentally friendly. The wheels were developed with Swiss wheel manufacturer Ronal. The company sells aftermarket wheels under the Ronal and Speedline brands, and it supplies OEMs. And it's no stranger to more environmentally-friendly wheel production. It supplies wheels for the Audi E-Tron GT that are made using a smelting process that produces oxygen rather than carbon dioxide, and it now has a line of claimed carbon-neutral aftermarket wheels. But back to the Mini's wheels. Using all recycled aluminum has the obvious benefit of not requiring new aluminum to be manufactured. But the benefits are greater than just the raw material use. Mini points out that a major improvement in carbon emissions comes from being able to skip the electrolysis process for new aluminum manufacturing. Pure aluminum is extracted from aluminum oxide (which is in turn taken from the mineral bauxite). To do this large amounts of electricity are passed through molten solutions of aluminum oxide and cryolite (which takes energy to heat) across graphite cathodes and annodes. Not only does this use a lot of electricity that has its own carbon costs, the oxygen that separates from the aluminum bonds to the graphite annodes, yielding more carbon dioxide (which is why the production of those Audi wheels is also interesting). In total, Mini says the recycled wheel production reduces carbon emissions by 75%. More specifically, it estimates about 0.16 kilograms (0.35 pounds) per kilogram (2.2 pounds) of aluminum used. Mini also stresses that this process still maintains all the strength of conventional wheels, just in a greener way. And of course, the wheels themselves are recyclable again. Mini, and BMW more broadly, are looking at ways to upscale the process and to source suitable recyclable products, likely other old wheels from cars no longer on the road. Though neither company said anything about when we'll see fully recycled wheels more widely available. Related Video: MINI Electric Pacesetter inside and out

The List: Best of proving grounds

Proving grounds are where automakers and enthusiasts alike go to push their vehicles to their mechanical limits. The Rubicon Trail, located in the Sierra Nevada, is the ultimate off-road test, while Germany's Nurburgring is a grueling 13 mile road and track course. Jessi and Patrick visit both iconic proving grounds in this "best of" compilation of The List. If you like what you see, stay tuned to watch the full episodes, or click here to go directly to our episode archive and pick out some of your own favorite moments of The List to revisit. The List #0004: Conquer the Rubicon Trail The List #0073: Drive the Nurburgring Have an RSS feed? Click here to add The List. Click here to subscribe to The List in iTunes. Click here to learn more about our hosts, Jessi and Patrick. BMW Jeep Off-Road Vehicles Racing Vehicles The List Videos Original Video