This isn't exactly GM Inside News but nonetheless still funny during the dog days of late December.

In September, GM issued TSB #16-NA-296 regarding the use of summer tires in cold conditions in light of cracks appearing in the treads of the high performance summer tires bolted to GM's performance models. Turns out customers were returning to dealerships with noticeable surface cracks appearing either across the tread or the shoulder area after driving in temperatures below 40° F.

The cracks don't result in a loss of tire pressure, but are damaging to the compound and capabilities of high performance summer rubber. As a result the tires should be discarded at the consumers expense, GM says cracked tires are not warranty worthy if the owner has driven their car in cold temperatures.

As per the TSB: "Competition oriented tires have rubber compounds that lose flexibility and may develop surface cracks in the tread area at temperatures below -7° C (20° F). Always store competition oriented tires indoors and at temperatures above -7° C (20° F) when not in use. If the tires have been subjected to -7°C (20°F) or less, let them warm up in a heated space to at least 10°C (50°F) for 24 hours or more before being installed or driving a vehicle on which they are installed. Do not apply heat or blow heated air directly on the tires. Always inspect tires before use."

In fact GM stresses extreme caution be exercised when using competition oriented tires in rainy or wet conditions, and recommends switching rubber once temperatures start hovering around 50° F.