Is Oil for High Mileage Cars Suitable for New Engines?.

Oil for cars with mileage over 120,000 km contains special additives that help prevent leaks inside and outside the engine — seals and gaskets become less vulnerable to wear, which reduces oil leakage and consumption. Additionally, it contains a large amount of detergents to remove dirt and deposits from the engine.

Will such oil harm newer engines, asks the publication Slash Gear.

Different Requirements for Oils

Modern car engines have quite high requirements for motor oils. They require oils with minimal phosphorus, sulfur, and other substances, a certain viscosity, and specific approvals from manufacturers. This guarantees the compatibility of the oil with modern exhaust gas cleaning systems, turbochargers, and other high-tech components.

Oils for high mileage cars usually have a higher additive content, which does not always meet the requirements of modern systems and may even cause damage, for example, clogging of the diesel particulate filter.

Different Design and Materials

New engines operate with more precision in the movement of parts and use new materials with less friction. They are designed for oils with specific characteristics that provide optimal lubrication and cooling.

Oils for high mileage cars contain special substances to restore seals or have a higher viscosity to compensate for wear. However, in new engines, this can lead to increased pressure, poor lubrication, and other issues.

Viscosity

Oils for high mileage cars may have a higher viscosity to compensate for engine wear. Modern engines are designed to operate with oils of lower viscosity, which provide better fuel economy and other benefits.

Therefore, using motor oils for high mileage cars in new engines is inappropriate. It is important to use oil that is recommended by the vehicle manufacturer.