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The Mercedes-Benz Axor 1840 LS is a medium—range tractor truck designed to transport large and heavy loads over different distances.
It is equipped with an in-line 6-cylinder OM457LA engine with a capacity of 401 hp (295 kW) and a displacement of 11,967 cm3.
The car is operated in harsh conditions, almost constantly with an acceptable maximum load, year-round.
During the next maintenance, it was decided to test the RINNOL OLGER PREMIUM 10W-40 DPF engine oil under the operating conditions of this vehicle.
RINNOL OLGER PREMIUM 10W40 DPF is a high-quality fully synthetic engine oil with a long service life to provide effective protection for heavy-duty diesel and gas engines of the new generation. Created using the latest low-ash additive packages to maintain engine performance at maximum levels for a longer time.
RINNOLOLGERPREMIUM 10W-40 DPF engine oil meets the requirements of the specifications:
API CI-4 plus, ACEA E6/E7-12, MB-228.51/226.9, MAN M3477/M3271-1, Volvo VDS-3, Renault Trucks RLD-2/RXD/RGD, MTU Type 3.1, Deutz DQC-III-10 LA, Cummins CES 20076/77, Mack EO-N, JASO DH-2
Основные физико-химические показатели RINNOL OLGER PREMIUM 10W-40 DPF
| Naming of the indicator | Test method | Unit of measurement | Meaning |
| Density at 15 °C | ASTM 4052 | g/cm3 | 0,878 |
| Viscosity at 100 °C | ASTM D445 | mm2 /s | 12,5-16,5 |
| Viscosity index | ASTM D2270 | 150 | |
| Flash point | ASTM D92 | °C | 220 |
| Solidification temperature | ISO 3016 | °C | -35 |
At the time of the start of testing, the car’s mileage was more than one million kilometers, namely 1,186,000 km. Quite a “serious” mileage for this type of equipment.
In order to monitor in detail the trends in the characteristics of engine oil, a schedule for the selection of intermediate samples for laboratory tests was established. Oil samples were taken on runs of 5,000 km, 16,000 km, 29,842 km, 40,621 km, and when oil was changed on a run of 53,119 km.
RINNOL OLGER PREMIUM 10W-40 DPF engine oil has successfully worked the entire interval.
Let’s consider the results of a laboratory study of used oil: changes in viscosity, base and acid numbers, the content of wear products and soot, as well as conclusions about the stability of oil characteristics.
Viscosity characteristics of the oil
The change in the kinematic viscosity of RINNOL OLGER PREMIUM 10W-40 DPF oil in the internal combustion engine of the Mercedes-Benz Axor 1840 LS is shown in the diagram:
An analysis of the dynamics of changes in kinematic viscosity at 100 ° C of RINNOL OLGER PREMIUM 10W-40DPF oil in the internal combustion engine of a car that participated in the tests shows that the oil, during the entire test period, retains viscosity values at 100 ° C within the permissible standard values of the SAEJ300 classification, which indicates the stability of viscosity-temperature properties. In general, RINNOL OLGER PREMIUM 10W-40DPF oil adequately withstood the load: there was no sharp jump in viscosity (neither upward from oxidation nor downward from polymer destruction), the oil retained the necessary conditions for lubricating parts.
Base and acid number
One of the important indicators for diesel oil is the total base number (TBN), reflecting the stock of detergent and neutralizing additives. RINNOL OLGER PREMIUM 10W-40 DPF engine oil belongs to the so-called “medium-duty” ones, which can be operated in very difficult conditions in EGR engines with and without a particulate filter, as well as for some engines with the SCR NOx system. Recommended for internal combustion engines with a particulate filter (DPF).
The changes in acid and base numbers are shown in the diagram.
The TBN of Fresh oil was about 9.2 mg KOH/g, an excellent indicator for oils of the E6/E7 category. During operation, this indicator was expected to decrease.
According to the analysis results, the base number of the oil decreased to 7.2 mg KOH/g. This is a fairly high residual level, well above the critical limit (~4.5 mg KOH/g, at which the oil is considered to have exhausted its life). In other words, even after intensive operation, the oil has a sufficient alkaline reserve that protects the engine from corrosion and deposits.
Reducing the base number is not critical, which indicates the stable detergent-dispersant properties of the oil. It decreased by about 22.8%, while a drop of more than 50% is considered critical. Despite the fuel entering the oil system and the accumulation of soot (0.2%), the oil retains a significant service life. A normal feature is that after a regular top—up of about 3 liters of oil after 40,000 km of mileage during operation, there was a slight recovery in the alkaline number – it increased from 7.2 to 7.4. This is an excellent result, taking into account the extreme operating conditions, fuel ingress and soot accumulation during such an inter-service interval.
The acid number (TAN), which characterizes the accumulation of acidic oxidation products, increased slightly. In fresh form, the acidity index was low (less than 2 mg KOH/g). By the end of the test, the acid number reached only 2.93 mg KOH/g, which indicates that the oil would still have a significant resource if not for extraneous factors. A small increase in TAN with a significantly higher TBN indicates the effective operation of the detergent-neutralizing additive package: the acids formed during the combustion of diesel fuel were successfully neutralized. The acid number does not exceed the base number and does not even approach it. Its growth was insignificant and remains within the normal range, which also confirms the good condition of the oil. The ratio of TBN to TAN remained high, meaning the oil retained its ability to prevent acid corrosion. Thus, according to the chemical indicators of aging (base/acid number) RINNOL OLGER PREMIUM 10W-40 DPF engine oil has shown excellent stability.
Wear products in oil
Laboratory analysis of the metal content in the waste oil showed minimal engine wear. The concentration of iron (Fe), the main indicator of wear of the cylinder piston group, increased to only 15 mg/kg over the entire period of operation. This is an excellent result for a diesel engine with such a huge mileage and operating under heavy conditions under high loads. The accumulation of iron at such a low level indicates that the oil effectively protects friction pairs (cylinders, rings, valve gear) from wear even when constantly working under load.
Other wear markers, such as aluminum (Al, from pistons), copper and lead (Cu/Pb, from plain bearings), chromium (Cr, from rings), etc., are practically absent. The absence of a high concentration of non-ferrous metals confirms that neither the piston group, nor the turbocharger, nor the main and connecting rod bearings have undergone abnormal wear. In other words, the antifriction and anti-wear additives of RINNOL OLGER PREMIUM 10W-40 DPF oil worked effectively, forming a strong oil film and preventing metal-to-metal contact even under high load conditions. The combination of low wear metals allows us to conclude that the Mercedes-Benz Axor 1840 LS engine with RINNOL OLGER PREMIUM 10W-40 DPF oil survived the test without deterioration of its condition – the oil reliably protected the parts from wear.
Soot and fuel content
In a heavy-duty diesel engine, it is critically important how much soot accumulates in the oil, as soot can increase viscosity and accelerate wear. During the test, the soot content in the oil turned out to be low. According to the laboratory, the proportion of soot particles in the waste oil was only 0.2% by weight. This indicator changed from the moment of the first sample and was fixed at the intermediate stages. 0,07%, 0,11%, 0,15%, 0,17% this indicates incomplete combustion of fuel, the possible use of low-quality fuel. However, the soot index of 0.2% during oil change also indicates the high quality of the dispersing additive package. The oil effectively kept the soot particles suspended and prevented the formation of sludge.
In some samples, fuel was found to have entered the oil during the analysis. The figures ranged from 0.2% to 0.3%.
It is not uncommon for loaded engines to get a small amount of unburned fuel into the oil. In our case, the presence of up to 0.3% fuel in the oil did not affect the viscosity parameters of the tested oil.
Table of engine oil characteristics
| Product | RINNOL OLGER PREMIUM 10W-40 DPF | |||||
| Technic | Mercedes-Benz Axor 1840 LS | |||||
| Mileage | 1 191 000 | 1 202 000 | 1 215 842 | 1 226 621 | 1 239 119 | |
| Oil production | 5 000 | 16 000 | 29 842 | 40 621 | 53 119 | |
| Topping up the oil | 3л | |||||
| Wear indicators | Iron ppm | 6 | 10 | 15 | 13 | 12 |
| Lead ppm | 0 | 0 | 0 | 0 | 0 | |
| Copper ppm | 0 | 0 | 1 | 0 | 1 | |
| Tin ppm | 0 | 0 | 0 | 0 | 0 | |
| Chrome ppm | 0 | 0 | 2 | 1 | 0 | |
| Aluminum ppm | 2 | 3 | 1 | 0 | 2 | |
| Nickel ppm | 0 | 0 | 0 | 0 | 0 | |
| Pollution | Siliconppm | 1 | 0 | 0 | 1 | 2 |
| Soot % | 0.07 | 0.11 | 0.15 | 0.17 | 0.20 | |
| Water % | 0.0127 | 0.0282 | 0.0212 | 0.0158 | 0.0192 | |
| Sodium ppm | 2 | 2 | 2 | 3 | 2 | |
| Fuel % | 0.00 | 0.00 | 0.02 | 0.03 | 0.02 | |
| Additives | Calcium ppm | 2620 | 2710 | 2530 | 2590 | 2410 |
| Zinc ppm | 960 | 980 | 949 | 956 | 943 | |
| Phosphorus ppm | 796 | 808 | 798 | 827 | 781 | |
| Magnesium ppm | 42 | 89 | 130 | 121 | 88 | |
| Molybdenum ppm | 62 | 59 | 58 | 61 | 55 | |
| Boron ppm | 49 | 37 | 33 | 43 | 31 | |
| Oil condition | Total Base number mgKON/g | 8.9 | 8.2 | 7.7 | 7.2 | 7.4 |
| Total Acid number mgKON/g | 2.22 | 2.45 | 2.63 | 2.75 | 2.93 | |
| Viscosity at 40°C cSt | 100.50 | 95.09 | 95.00 | 98.89 | 97.30 | |
| Viscosity at 100°C cSt | 14.5 | 13.75 | 13.62 | 13.81 | 13.76 | |
| Viscosity index | 153 | 145 | 142 | 149 | 143 | |
Test result
The test results of RINNOL OLGER PREMIUM 10W-40 DPF engine oil in the Mercedes-Benz Axor 1840 LS engine fully confirmed the possibility of extending its replacement interval to 50000km.
In order to increase the oil change interval on machinery, as well as to periodically monitor the quality of the oil in engines for which an extended replacement interval has been confirmed, it is recommended to regularly use the system of periodic engine oil checks as a tool for monitoring the condition of engine oil (analysis). In addition to monitoring the condition of the lubricant, this system will help to monitor the condition of equipment and predict in advance the required repairs, which in the future will prevent the occurrence of unforeseen breakdowns and downtime of machines.
Thus, the lubricant ensured reliable operation and protection of the engine with a good margin of operational properties, which confirms the excellent quality and reliable performance of the OLGER PREMIUM 10W-40 DPF engine oil even in difficult operating conditions.
