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Availability and cost are a problem for Mobil 1 ESP 0W-40. Until the big-box stores start carrying it, it's likely less expensive to change to 15W-50 for track and then back to 5W-30 for street.
At my local Walmart, Mobil 1 15W-50 and 5W-30 (5 quart) is only $22.88. The list price on Mobil 1 ESP 0W-40 (1L) is $11.32. For 5L (~5 quarts) that's $56.60. It can be found for less online, but that usually involves a shipping charge which is going to still result in a price much higher than $22.88 for 5 quarts.
I love the thought of having a single oil that's good for street and track duty, but if the price is double+, it negates the benefit.
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