At approximately $6.00 per gallon for the new type oils vs $5.00 per gallon for older type oils, increased operational costs could be forecasted. Higher reach upper rings and oils containing greater dispersants reduce oil consumption. Reduced blow-by gases reduce crankcase contamination. Oil consumption and crankcase contamination are reduced by using a newly designed upper piston and piston ring. Diesel only oils will carry no "S" classification. This "wide spectrum" oil may be used in gasoline or diesel engines. Many current multi-viscosity oils are classified SE/SF/CF. Many diesel engine oil experts forecast that in the near future diesel oils (CG) will be classed as diesel only. Oil that meets this standard is necessary for these new engines to meet desired operational, emission, and longevity standards. These changes are based on using new API CF4 rated oil. Other manufacturers, Detroit Diesel, Cummins, and Caterpillar, have also increased their recommended drain intervals. These are a part of the "new breed," lower emission engines currently in production. These increased intervals are effective for most 1990 and later model vehicles used under on-highway conditions. Mack Truck has recently approved 25,000 mile crankcase drain intervals, up from 15,000 and 20,000 mile intervals formerly recommended. Amsoil claims a four to eight percent increase in fuel economy when using their product. Present fleet tests of 90,000 mile drain intervals have found the oil free and clean of deposits and suitable for continued use. Amsoil has produced premium, synthetic based API approved diesel engine oils since 1972. LESSON / INFORMATION: Sixty-thousand (60,000) mile diesel oil change intervals have been successfully achieved in fleet operation using Amsoil synthetic based oils. understand that synthetic diesel engine oils reduce disposal, recycling costs, and potential environmental pollution. learn that synthetic diesel engine oils reduce the demand on oil stocks.Ĥ. recognize that synthetic diesel-engine oils extend crankcase oil drain intervals and the use of these oils can save energy by reducing internal engine friction.ģ. be aware of the differences between natural and synthetic diesel engine oils.Ģ. To understand how longer crankcase drain intervals can save energy.ġ. To understand the use of synthetic oils in diesel engines. ![]() ![]() 90,000 Mile Diesel Engine Oil Changes? 90,000 MILE DIESEL
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