After an oil change, some engines emit an unfamiliar knocking sound. This observation is noted by Vadim Strelbitsky, who oversees the mechanical repair department at Avilon Kia, as reported by Rossiyskaya Gazeta. He outlines five possible causes for the noise following an oil change.
The first clue is hydraulic in nature: too little oil or an excessive amount can disturb normal engine operation and produce knocking. Each engine has a delicate oil balance, and deviations from this balance can manifest as abnormal sounds that are often mistaken for more serious mechanical issues.
A second common culprit is a dirty oil pump filter. When the filter is clogged, oil flow is restricted, oil pressure drops, and the engine may begin to knock as components fail to receive steady lubrication. Regular filter maintenance is essential to maintain smooth engine performance.
The third factor concerns the post-oil-change lubrication timeline. It is possible that the engine and its filters simply need a short period to reach the optimal lubrication point after an oil change. In most cases, this interval is brief, lasting only a few minutes. If the knock persists beyond that window, further inspection is warranted.
The fourth reason points to the oil pump itself. A faulty pump can fail to supply enough oil pressure to critical bearings, resulting in persistent knocking and potential damage if not addressed promptly.
The fifth potential cause involves the use of low-quality oil or filters. Subpar lubricants and filtration can undermine engine protection, leading to noise, accelerated wear, and higher risk of overheating over time.
Mikhail Kolodochkin, a former auto expert for Za Rulem magazine, notes that oil leakage can cause strong friction among moving parts inside the power unit. This accelerates wear and may limit the vehicle’s travel before serious problems emerge. Under favorable conditions, the vehicle might cover around two hundred kilometers before issues become critical, but in typical scenarios, problems can appear sooner and escalate to overheating or seizure of components if not corrected.
Is it possible to refill oil using a brand from a large chain store? This question often arises when drivers observe noises after an oil change. While branded and reputable oils can be suitable, proper selection depends on the vehicle’s specifications, the exact viscosity grade required, and the compatibility of additives. Consulting the vehicle’s manual or a qualified technician helps ensure the right choice for optimal protection and performance.