What lubricant do hybrid engines need?

In recent years, hybrid vehicles have gone from being a novelty to something we see far more often on the streets. Its combination of combustion engine and electric propulsion offers advantages in efficiency and emissions, but also poses new challenges for maintenance and, therefore, the engine’s lubrication. 

An engine that works differently

Unlike a traditional combustion engine, a hybrid engine does not run continuously, alternating on and off periods depending on driving needs and battery charge. 

Hybrid engines also operate at lower temperatures for much of the time. In many situations, such as when starting up the engine or driving at low speed, the electric motor drives the vehicle totally or partially, reducing the time and effort the combustion engine has to make. This can also mean long periods without reaching the optimum operating temperature, which influences the formation of condensation and residues.

Lubricant characteristics in a hybrid engine

These particularities directly affect the engine oil, which must meet additional requirements beyond the usual ones: 

• Protection against wear and tear on frequent start ups: each ignition involves a critical moment of friction that the oil must cushion.
• Stability at low temperatures: to ensure fluidity and immediate protection.
• Control of sludge and moisture formation, because the engine does not always reach temperatures that evaporate condensation.

Compatibility with aftertreatment systems: such as catalytic converters and filters, which require oils with low ash, phosphorus, and sulfur content (Low SAPS).

Which oil should we choose for a hybrid vehicle?

Choosing the right lubricant for a hybrid engine must meet the vehicle manufacturer's specifications and, in addition, offer:

• Low viscosity to reduce friction and improve energy efficiency.
• High-quality additives that keep the engine clean and protect against corrosion.
• Synthetic formulation for greater thermal and chemical stability.

At Repsol Lubricants, we develop oils specially designed for the working conditions of hybrid engines, such as our Repsol Master Eco Hybrid range, which combines all the above features. You can find the product that best suits you on our portal’s search engine by just typing in the license plate or vehicle model. 

Maintenance - the key to prolonging the hybrid’s useful life

Finally, we must remind you that oil changes are still essential for the maintenance of a hybrid vehicle. Following the manufacturer's recommended periods between oil changes  and always using a quality lubricant is the best investment to ensure engine performance and durability.