Difference of diesel oils for trucks and cars
02 January
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The principles of control systems, power supply and operation of diesel engines of trucks and passenger vehicles are identical. Constant aspiration to the improvement of the design of diesel engines, led to the fact that the speed of the "diesel engines", including trucks, rose and almost came close to the values of the speed of the gasoline units. However, the tightening of environmental standards for exhaust emissions, led to the fact that passenger cars with diesel engines were equipped with systems of selective neutralization through the injection of an aqueous solution of urea. Carefully consider what are the differences between oils for diesel engines of trucks and cars.

The main differences between the oils for diesel engines of trucks and cars are the use of different additive packages in the production data lubricants. Use in the production of various additive packages caused primarily by different working conditions of diesel engines. A modern diesel engine of a passenger car is a highly accelerated turbocharged engine of small volume, operating in a wide rev range. But diesel engines of trucks usually work in lighter conditions, with a narrower rev range and smaller loads. But even with such milder conditions, robots, fuel consumption in heavy diesel engines is incommensurably higher. This circumstance inevitably leads to increased soot formation and gradual dilution of the oil with fuel, which requires enhanced detergent-dispersant properties from the engine oil. In the process of burning diesel fuel, a large amount of soot is formed, which in the combustion chamber is combined into aggressive large particles. These combined particles deposited on the elements of the connecting rod-piston group, cause a significant increase in wear of the pistons, piston rings and the walls of the engine cylinders. Therefore, diesel oils for trucks contain in their composition two times more additives than diesel oils for passenger cars. A significant proportion of the additive package for diesel engines of trucks consists of additives - dispersants, designed to effectively deal with the formation of combined carbon black conglomerates, the deposition of these formations on engine parts and, as a consequence, increased wear of its elements.

So why then do not use motor oil for heavy vehicles in diesel engines of passenger cars? Can I use, for example, Protec SD 10W-40 API CI-4 \ SL or TEMOL Premium Diesel 10W-40 API CI-4 \ SL oil in diesel engines of passenger cars? After all, these oils are made on additives of the world leader - American company AFTON CHEMICALS (USA). This is a premium quality, so it is possible to apply on any type of equipment?

Not so simple. And the answer is NO, not in normal situations.

The reason lies primarily in the very additives - dispersants. According to a study conducted by the Japanese automobile standards organization JASO, it was determined and confirmed that a large amount of dispersants in engine oil leads to accelerated wear of the valve mechanism of diesel engines of passenger cars. Also, diesel oils for trucks have rather high base number values, the reserve of which means the presence in the oil of special additives designed to neutralize acidic compounds that are actively formed during the combustion of diesel fuel. So, in the above-mentioned oils for trucks of class API CI-4 \ SL, the base number reaches high values. At the same time, the base number of diesel oil for passenger cars TEMOL Luxe Diesel 10W-40 is lower, while the universal oil TEMOL Luxe 10W-40 API SL \ CF is even lower.
But this is certainly the most important stock of an alkaline number for trucks, invariably leading to an increase in the ash content of the oil and will have a negative effect on the catalysts and particulate filters installed on the vast majority of modern passenger cars with diesel engines.

The use of motor oil for cargo diesel vehicles in a light-engine diesel engine is possible only in exceptional cases, for example, when you do not have exactly the lubricant recommended for use by the manufacturer of equipment, and the oil level drops below the critical level and the oil pump does not create the required level pressure. In all other cases, Roman Chebaev OilAcademy speaker from KSM Lubes does not recommend using oils for trucks in passenger diesel cars.