How to choose engine oil for a diesel engine, considering its features?

Diesel engines have their own characteristics that require the use of specialized motor oils. They are usually characterized by a high content of sulphated ash, phosphorus and sulfur, which is necessary to neutralize the combustion products of diesel fuel and protect the engine from corrosion and wear.

API specifications such as CH-4, CI-4, CJ-4, and ACEA E4, E6, E7, and E9 are specifically designed for diesel engines. The choice of a specific oil depends on the type of diesel engine (with or without turbocharging, with or without a particulate filter), its environmental class and the recommendations of the car manufacturer.