HTHS - oil viscosity parameter

Let's take a look at what HTHS is and what it affects.

HTHS - a parameter that determines the thickness of the oil film in the most stressed areas of the engine, such as the cylinder walls, they are always under heavy load during the piston stroke. This parameter is determined as standard at a high temperature of 150 degrees. In order to more accurately understand the meaning of this parameter, we will analyze one more concept.

Engine with regular oil change, maintaining the required viscosity level

High shear rate is a relative value that characterizes the intensity of the impact on the oil film, which protects parts from wear. As it may seem to many, but this is not the piston stroke rate, it is the stroke rate divided by the thickness of this very film, measured in 1 / s.

Oil film thickness

The thickness of the oil film has its optimum value. If it becomes very thin, friction increases and the surfaces come into contact. If the film is too thick, then there are large friction losses, there is of course no wear, but efficiency decreases, due to the fact that it is more difficult for the engine to mix the thick film.

How can oil film thickness adversely affect engine performance? Let's say your engine has already run thousands of kilometers and any engine in this case has wear on the cylinder walls, pistons, rings, etc., as a result of which, engine compression your car is likely to fall, resulting in a loss of power. Especially for this, there are special additives that allow you to increase the thickness of the oil film, or in other words, to improve the HTHS parameter of the oil, due to the fact that the distance formed due to wear between the piston and the cylinder fills a film of higher viscosity, which makes it possible to increase the sealing of the combustion chamber and how the consequence is an increase in engine efficiency.