There are several rules of thumb you can use to determine when to change the oil in a 5.9L Cummins: The majority of these work trucks need their oil changed more frequently to stay in top condition. Light service refers to trucks usually only used for commuting, while severe service trucks operate in intense hot or cold weather, run on rough terrain, or haul heavy loads. There are two types of driving with a truck - light service and severe service. That improved life span translates to longer oil change intervals and greater engine longevity. Cost: Although synthetic oils often cost more than conventional formulas, they help protect the useful life of your vehicle.This slower process means you’ll need fewer oil drains and you won’t have to spend as much money on oil. Oxidation and thermalization: Less oxidation occurs over time with synthetic lubricants compared to traditional alternatives.Viscosity: The higher your viscosity index, the higher the likelihood that the fluid’s consistency will remain stable in different temperature environments.Low-temperature flow: Synthetic lubricants have special additives designed to reduce friction within the engine and promote flow, even during low ambient temperatures.Generally, the higher the flash point, the more reliable the oil - synthetic oils tend to have substantially higher flash points than conventional formulas. Flash point: The flash point of an oil denotes its tendency to have a combustive response when its vapors are exposed to an ignition source, revealing the lowest possible temperature when the oil will catch fire.There are several reasons diesel engine owners should choose a synthetic oil solution: You’ll want to use a synthetic formula to maximize the health of your truck. That’s why Hot Shot’s Secret has created the step-by-step guide to the 5.9L Cummins on how to choose an oil and maintain your engine over time.Īll 24- and 12-valve Cummins engines come with a 12-quart oil capacity. The Cummins is a high-power engine with premium performance, but it’s only as good as the fluids that keep it running smoothly. The heat transfer coefficient is most important and its well know water has a high heat transfer coefficient, much higher than glycol.5.9-Liter Cummins Fluid Capacity and Selection Thermal conductivity is relatively unimportant for a cooling system operating under a turbulent regime. Heat transfer coefficient and thermal conductivity are the respective measurements for these parameters. Specific heat is a measure of how much energy the coolant can adsorb and has no relation to how well (or fast) it may transfer to another surface or conduct heat within the fluid. So the temperature increased by 44oF after converting to the Evans product.īy having engine cylinder head temperatures 128oF hotter with the Evans product, a number of performance setbacks were observed: (1) the octane requirement was increased by 5-7 numbers, (2) the computerized ignition system retarded timing by 8-10o to avoid trace knock, (3) horsepower was correspondingly reduced by 4-5%, as confirmed on a chassis dyno. We saw a stabilized bulk coolant temperature of 192oF with water and No-Rosion, and 236oF with the Evans product. (No-Rosion does not alter the specific heat capacity of water.)Ĭylinder head temperatures of 115-140oF hotter with the Evans products translates to a stabilized bulk coolant temperature increase of 31-48oF, as compared to No-Rosion and water.Īs case in point, conversion of a Chevrolet LS-1 engine from No-Rosion and water to Evans Waterless Coolant resulted in an increase of 128oF at the cylinder heads. So they conduct roughly half as much heat as does water, or water with No-Rosion. Comparatively, the specific heat capacity of the various glycol solutions in the Evans products ranges from 0.64 to 0.68. It transfers heat more effectively than any other fluid, and is therefore used as the reference fluid in the scientific measure of specific heat capacity. Water has a specific heat capacity of 1.00. The reason for hotter cylinder heads relates to the specific heat capacity of these different fluids. After proper conversion to the Evans products, the average temperature of engine cylinder heads increased by 115-140oF, versus running with No-Rosion and water.
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