![]() In recent years, the demand for online oil measurement and data management has been increasing. The assessment of oil viscosity makes it possible to select an appropriate interval between subsequent oil changes, which has a significant impact on the operating and maintenance costs (operation and maintenance). Therefore, a regular replacement of oil forms an essential part of a car maintenance program. An increase in kinematic viscosity is associated with oxidation processes at elevated temperatures and a decrease with oil shear or dilution with unburnt fuel. Viscosity values may increase or decrease during operation. In fact, in the automotive industry, monitoring the viscosity of lubricants is considered a principal indicator of oil quality. It is then particularly important to monitor the properties of oil especially, as its degradation can eventually lead to engine damage or failure. High temperature solid impurities (such as soot, coke, products of tribological wear of the engine, corrosion products, etc.) and the external ones (moisture, air dust, air, and other gases), as well as shear, oxidation, and nitration processes are some of the key factors contributing to the degradation of engine oil. ![]() The study fills an important gap in empirical research in the context of the reliability of measurement results obtained using various research techniques.Įngine oil ensures smooth engine operation through its lubricating and cooling effects yet, with time and use, it becomes subject to degradation processes. Therefore, a very careful approach is suggested when choosing these instruments. It was also found that the results obtained with the use of the mid-FTIR spectrophotometer were burdened with a very large measurement error. Consistent outcomes were obtained for the Stabinger viscometer only, whereas the microchannel viscometer and the mid-FTIR spectrophotometer were not as precise as the reference method. The main data analysis tools used in the study were multiple regression, Mahala Nobis distance, post-hoc analysis, and the Wilcoxon signed-rank test with the Bonferroni correction. The study material comprised 42 fresh engine oils, all of which are commercially available. The following instruments were selected to measure: a mid-FTIR spectrophotometer, a microchannel viscometer, and a Stabinger viscometer. If your tractor or truck calls for 20W hydraulic oil, it may be best to use the thicker ISO 68 in hot temperatures and thinner ISO 46 in cold weather.The aim of this paper is to compare the results of kinematic viscosity of lubricating oils measurements at 40 ☌, obtained with three different rapid evaluation devices, and the standardized method using an Ubbelohde Capillary viscometer. This is because the ISO specifications are broad, and they overlap with SAE weights in some cases. You may notice that ISO 46 can replace both 15W and 20W SAE oils. Only use this chart to find an oil equivalent to the manufacturer’s recommended oil for your tractor or truck. It’s important to get the right hydraulic oil for your tractor or truck to make sure that the hydraulics work well and last for a long time. However, even if it is extremely hot, you should not use a thicker oil. In very cold weather, you may want to use a thinner hydraulic oil, because the cold thickens your oil. Oil in extreme temperaturesĭepending on the temperature you run your engine in, you may want to use a slightly thicker or thinner oil. ![]() This oil conversion chart is approximate. This ensures that one brand's 30-weight oil is the same viscosity as another's. ISO and SAE are standardized specifications that define oil weight. If you bought a tractor and need to change the oil or hydraulic fluid, and you’re not sure which weight to buy, here is a helpful oil conversion chart that may make things easier. This would not be a problem if hydraulic oils weren’t labeled using the ISO system now, but they are. Often, the hydraulic oil for an older tractor is listed using an SAE oil weight. Also, oil has changed since the old days, and the way manufacturers list the recommended oil is sometimes different from the way oils are labeled now. Owner’s manuals are important because they include the tractor’s specifications, replacement parts, and which oil it requires. Vintage tractors and tillage equipment are usually bought at auctions, so collectors don’t always have access to their owner’s manuals.
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