I have primarily used Mobil 1 0W-40, but have used 10W-40 once or twice. (Including in the snow, very rarely lower than 0° F)
Once I use up the Mobil 1 0W-40 I already have I plan to switch to Castrol 10W-40.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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