| Check | How | Verdict |
|---|---|---|
| 1. Oil cooler exterior | Look between fins for oil film, dust, debris | Blow out / low-pressure wash along the fins — fastest visible win |
| 2. Return filter | Pull it: clogging, particles | Due or dirty = change; metal particles = hunt the wear source |
| 3. Cooling fan | Fan speed, belt, fan motor | Low airflow = poor cooling |
| 4. Bypass valve | Pull and inspect the cooler bypass | Stuck open = oil skips the cooler straight back to tank |
| 5. Oil condition | Color, viscosity, burnt smell | Oxidized or wrong grade: change oil and flush the tank |
Chronically hot oil ages seals early and grows pump/valve leakage — cooling is cheap insurance. Overheating with a clean cooling chain? Then test main-pump case drain and internal leakage.
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Per the manual interval, sooner on dusty sites — send the model and we confirm the right element.
Yes — low-pressure water along the fins, never a jet straight into them.
Briefly at light load; prolonged heat eats seals and pumps.
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