Users sometimes wonder if two different engine oils may be…
Diesel particulate filters (DPF) installed on all modern vehicles will perform great job at removing particulate matter from the exhaust gasses. Sooner or later, however, these devices will inevitably get partially blocked by the soot and by ashes (sulphated ash), accumulating on the internal surfaces of the DPF. One might wonder if this is really a matter of great concern.
Several studies with Heavy Duty vehicle engines have been carried out. They demonstrated the negative effect of ash on the so-called exhaust Backpressure of the engine. And backpressure is linked to fuel consumption.
Back pressure refers to pressure opposed to the desired flow of a fluid in a confined place. It is often caused by obstructions. Back pressure in four-stroke engine has a negative effect on engine efficiency. Increased backpressure will result in a decrease of power output, which will need to be compensated by increasing fuel consumption.
In a study performed by Lubrizol, called “Continued Investigation of Lubricant Effects on Diesel Particulate Filters”, it was observed that the rate of exhaust back pressure increase for vehicles using 1.8% sulphated ash lubricant was 5 times higher than those operating on 1.0% sulphated ash oil.
Using the correct low ash oil will thus have a direct effect on your vehicle’s efficiency and fuel economy.