Engine oil acts as a ‘’pillow’’, the piston brushes against the propeller while functioning and this is why it is key that our engine oil has an adequate viscosity. Viscosity is the quantity expressing the internal friction of the fluid.

Oil is one of the most indispensable components of an engine, it executes its functioning synchronously with the mechanical parts in action. Without the engine oil, or a reduced amount of oil, the cylinders would go through seizure, that is to say that they would get trapped inside the combustion chamber, this might damage the chain determining so an irreparable destruction of the engine.
There are no oils that could provide more horsepower to your vehicle, but if used correctly engine oil guarantees the optimal conditions for your vehicle to properly function for a long-term.

What is engine oil? How to select the perfect lubricating oil for your vehicle?
As suggested by Rete Riparo, in common four-stroke engines, engine oil is the ‘’pillow’’ which brushes against the piston without touching it completely. This is why it is crucial to have an oil of an appropriate viscosity. If it is too runny this might slip during the piston’s action and leave behind metallic fragments which will rub against each other. Modern engines work according to operating temperatures that are constantly monitored by thermal sensors, these decide if it is needed to activate the radiator fan as to increase engine cooling, consequently this, if too heated could convey, what is generally called ‘controlled thermal expansion’, to all involved parts in the mechanic of the propeller.
This way, piston’s cylinder, dilates and it will continue to dilate for as long as it is possible to the combustion chamber to dilate. The oil that is in it, consequently to the growing heat might vary its viscosity until becoming way to runny.

How to choose the best engine oil? Oils can be classified into two main categories: mineral oils and synthetic oils. The first category, mineral oils, is essentially refined petroleum oils which undergo treatment to function under a wide range of temperatures. While synthetic oils are entirely made in the laboratory. All these types of oil are identified under two types of acronyms. The oldest one is SAE, which from 1911 grade engine oils based on their viscosities. Commonly it is presented as: SAE 10W40. Let’s see what each character that makes up this alpha-numeric code means. The first number weight that oil emulates in cold temperatures. The smaller the number, the better will be the flow. The ‘’W’’ stands for Winter and represents how the oil will react to a cold start. The number following indicates how the oil will flow at normal operating temperatures.
In order to choose the best oil, a few variables are needed to be taken into consideration. What is reported in the maintenance booklet and with is specified on the oil can. The best thing to do is follow the advices given by the vehicle manufacturer, and avoid doing your own way, if you do not have the appropriate mechanical understandings. Obviously your trustworthy mechanic will be more than ready to advise you choosing the best engine oil.

About the author : Ilaria Seva

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