Uploaded January 2026 | Updated September 2026, 2 days ago

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If you found oil in your coolant reservoir, oil in your antifreeze, or a brown oily film inside your coolant tank, this video explains exactly what it means. A short and clear guide from an experienced mechanic covering symptoms, the 5 real causes, and how to fix each one.

We also cover common situations like oil in coolant but no coolant in oil and oil in coolant reservoir but car not overheating. Don’t ignore this problem—oil inside the cooling system can quickly damage your engine, radiator, and water pump.

Chapters:
0:00 - Intro
0:29 - Symptoms
1:09 - Blown Head Gasket
1:38 - Cracked Cylinder Head / Block
1:58 - Failed Oil Cooler
2:22 - Transmission Cooler Leak
2:40 - Contaminated System
2:56 - How to Fix It