Here is what the manufacturer recommends.
FLUID SPECIFICATION SF/CC, SF/CD (Motor Oil, API Service SF, CC, CD)
Approved engine oil viscosity in relation to temperature
Below -13°F/-25°C to Above +86°F/+30°C 0W-30, 0W-40
Above -13°F/-25°C to Above +86°F/+30°C 5W-30, 5W-40, 5W-50
Above -4°F/-20°C to Above +86°F/+30°C 10W-30, 10W-40, 10W-50, 10W-60
Above +5°F/-15°C to Above +86°F/+30°C 15W-30, 15W-40, 15W-50
Above +23°F/-5°C to Above +86°F/+30°C 20W-40, 20W-50
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Thursday, September 13th, 2012 AT 1:13 PM