This article is devoted to the analysis of the influence of the operational properties of the hydraulic transmission fluid on reliability. Based on the analytical review and operational observations made by the authors of the article, it is recommended to introduce high-performance filters for cleaning the working fluid (oil) with a drop-out fineness of no more than 10 microns into the hydraulic system. Also recommended for hot climate conditions is the frequency of oil change, which should be 15-20% lower compared to non-hot climate conditions.

This article presents amazing secrets for the group of numbers from 0 to 9, and what the group of formed numbers holds in which the sum of the two numbers is equal to the original number in terms of: the number of binary numbers formed, the sum of the odd and even numbers for each group of these numbers, the absolute difference between the sum of the odd numbers and the sum of the numbers Even numbers of the resulting numbers in each case.

This article also presents the properties of the numbers 0 through 9, the numbers in the tens place corresponding to each number in terms of the sum of its digits and the absolute difference between each two respective numbers, as well as the prime numbers in each category of the tens place.

The article analyzes the dependence of the wear of engine parts on the evaporation temperature of gasoline. The main reason for the rapid wear of engine parts when using fuels with poor volatility is the washing off of oil from rubbing parts. To ensure optimal engine operation conditions in hot climatic conditions, we suggest that the start temperature of the distillation of gasoline boil not lower than 40°С ÷ 43°С, and the distillation temperature of 10% gasoline should not be lower than 70°С, and the boiling point of 90% for summer gasoline should not exceed 180°С, and the temperature end of distillation - 195°C.