When troubleshooting oil pressure drops, why should the oil filter be inspected?
A blocked filter can cause low oil pressure
The oil filter sits in the lubrication circuit, and all engine oil is pumped through it before reaching the bearings and moving parts.
If the filter element clogs with dirt and sludge, it restricts oil flow through the system, and the resulting flow restriction shows up as a drop in oil pressure.
Hence, the oil filter is inspected because a blocked filter can cause low oil pressure.
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