What are the consequences of adding oil additive to a car?

[Elsie]

It can lead to poor oil fluidity, resulting in increased fuel consumption. Below is relevant information: Oil additive: So-called oil additives are concocted by certain manufacturers as a type of engine oil additive. Their composition likely consists of viscosity index improvers and anti-wear additives, or a combination of both, without any particularly miraculous properties. It's important to know that qualified engine oils (whether for gasoline or diesel engines) already contain such additives, along with more detergents and dispersants. Typically, the main additive in gasoline and diesel engine oils is detergent, which prevents carbon buildup inside the engine and constitutes the largest proportion of additives. Function: Protects the engine, significantly reduces wear, prevents engine overheating, and extends engine lifespan.