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Old 01-18-2009, 01:49 PM   #4
P-51 Mustang
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Join Date: Aug 2007
Location: FL
Posts: 51
I choose the viscosity of oil based on mileage and temperature. If you have a high mileage car go with a thicker oil. If it is colder outside go with oil that is thinner when cold. The manual has a nice chart of good viscosity oils to use given a range of temperatures.
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