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A 0W-30 synthetic oil is appropriate for any US climate including Alaska to Arizona, and any Volvo engine including B23XF/T or B6304. Film strength and viscosity are superior, fuel economy is better (especially at start up) and engine cooling is better. Note that I wrote "synthetic" not dino oil, since a 0W-30 dino oil would have a high proportion of non-lubricating viscosity index improvers, absent from a synthetic. See the FAQ for more details. From Mobil:
Product Description
Mobil 1 0W-30 is the most advanced performance synthetic engine oil designed to provide the cleaning power, wear protection and enhanced fuel economy performance. Mobil 1 0W-30, Enhanced Fuel Economy Formula, exceeds the requirements of the latest industry standards required by newer modern gasoline and diesel powered automobile engines. The Mobil 1 technology is race proven and is the choice of race car drivers around the world. Mobil 1 0W-30 is perfect for all types of driving anywhere in the world and has the performance to protect where conventional engine oils do not.
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See the 700/900 FAQ under 'Select Link' button on the top right.
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