## 4 Results and Discussion
Furthermore, analyzing the data from the tables, it can be concluded that the best additive for new oil is the ceramic tube form of effective microorganisms, and for waste oil, the addition of liquid effective microorganisms works best. As for the silver solutions, they adversely affect the parameters of both new and used oil. All the presented results confirm the obtained results, which show that microorganisms in the shape of ceramic tubes fulfill their role better in new oil, compared to in liquid form in used oil. Colloidal silver deteriorates the properties of both new and used oil, regardless of its type. In regards to the flash point shown in Figure 10, better results were also obtained for used oil with effective microorganisms than for those with additional silver compounds. The higher flash point of approximately 202 \({}^{\circ}\)C was obtained for effective microorganisms in the liquid form. The remaining additives have a flash point temperature below that of used oil, i.e., approximately 199 \({}^{\circ}\)C. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & **Dynamic Viscosity in 2 \({}^{\circ}\)C** & **Flash Point** & **Acid Number** & **Base Number** & **Water Content** \\ \hline  & **[m\(\cdot\)Pa-s]** & [\({}^{\circ}\)C] & **[mgKOH/g]** & **[mgKOH/g]** & **[\%]** \\ \hline
**Fresh oil** & 596 & 212.4 & 2.560 & 3.907 & 0.096 \\ \hline
**Fresh oil and EM 2.5 mL** & 720 & 200.4 & 3.021 & 3.606 & 0.210 \\ \hline
**Fresh oil and EM 5 mL** & 713 & 199.6 & 2.497 & 3.444 & above 1 \\ \hline
**Fresh oil with EM 3 pcs** & 667 & 212.5 & 3.113 & 3.962 & 0.072 \\ \hline
**Fresh oil with EM 6 pcs** & 696 & 213.5 & 2.366 & 3.894 & 0.097 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Comparison of the parameters of new oil with and without effective microorganisms. Figure 9: Water content in used oil and used oil with effective organisms in liquid form and ceramic tubes. In regards to the fresh oil, statistical analysis was performed with a 95% significance level for used oil. The obtained results for water content and flash point for used oil and used oil with additives for this significance level also showed no significant errors and fell within the lower and upper confidence interval. Similarly, from the graph of viscosity versus temperature (Figure 11), it can be seen that better results are obtained for effective microorganisms, also in liquid, because at the 2.5 mL for 2 \({}^{\circ}\)C, the viscosity is 588 mPa-s. This means that this value was lowered to a level similar to that of new oil, for which the viscosity is 596 mPa-s at the same temperature. For example, for colloidal nanosilver in a quantity of 2.5 mL, a viscosity of 1050 at 3.5 \({}^{\circ}\)C \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & **Dynamic Viscosity in 2 \({}^{\circ}\)C** & **Flash Point** & **Acid Number** & **Base Number** & **Water Content** \\ \hline  & **[m-Pa-s]** & [\({}^{\circ}\)C] & **[mgKOH/g]** & **[mgKOH/g]** & **[\%]** \\ \hline
**Used oil** & 719 & 198.8 & 4.027 & 1.358 & 0.167 \\
** nanosilver 2.5 mL** & 580 & 202.4 & 4.373 & 0.937 & 0.606 \\ \hline
**Used oil and EM 5 mL** & 758 & 202.1 & 5.411 & 0.844 & above 1 \\ \hline
**Used oil with EM 3 pcs** & 732 & 197.5 & 6.027 & 1.250 & 0.017 \\ \hline
**Used oil with EM 6 pcs** & 652 & 198.1 & 5.499 & 0.749 & 0.054 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Comparison of the parameters of used oil without additives with waste oil with effective microorganisms.