c.Oil ViscosityOil viscosity (thickness) is described by SAE (Society of Automotive Engineers) Viscosity Grade. Coldertemperatures require lower viscosity oils to ensure good flow during starting, while hotter temperatures requirehigher viscosity oils for satisfactory lubrication. Based upon the temperature range you expect before your next oilchange, use the oil viscosity chart and the notes below to choose the proper viscosity grade. Using other viscositygrades, or using viscosity grades at temperatures outside the recommended ranges could result in enginedamage.d.Oil Change Interval(1)Refer to Maintenance Section of this manual for the recommended oil change interval. Use of oils exceedingthe required quality level, synthetic oils, or other oils claiming longer service intervals does not justify extending oilchange intervals beyond those recommended.(2)For diesel engines, the recommended oil change intervals are based on the use of diesel fuels with amaximum sulfur content of 0.5 percent. Know your fuel sulfur content. (Ask your supplier, or have fuel analyzed).If fuel contains more than 0.5 percent sulfur, reduce the oil change interval as follows:NOTEIt is NOT necessary to reduce filter change intervals when oil change intervals are reduced.Sulfur Content, PercentOil Change IntervalBelow 0.5Normal0.5 to 1.01/2 NormalAbove 1.01/4 Normal4-3
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