Ash and Sulfated Ash and their role in the performance of engines
Posted by Hamid Shakouri on 3rd Sep 2024
Ash content refers to the metallic residues, such as zinc and calcium, left behind when engine oil enters the combustion chamber and burns alongside the fuel. Zinc is a primary element in antiwear additives, while calcium comes from detergent additives.
These ashes adhere to the engine parts' surfaces. However, a significant issue arises when these oil-borne residues accumulate between the valve and valve seat, leading to 'valve recession.' Valve recession is a major factor that shortens the cylinder head's lifespan.
Managing ash content in engine oil is critical to preventing such issues and maintaining engine health and longevity. Manufacturers formulate oils with specific ash content levels to balance engine cleanliness, wear protection, and performance requirements. Regular oil changes using oils with appropriate ash content levels help mitigate the risks associated with ash buildup and ensure optimal engine operation.
The ash level of oils in diesel engines equipped with a DPF system plays a sophisticated role in clogging the DPF filter when the engines experience oil burning.
