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What to Do When Transmission Oil and Radiator Oil Mix?

1 Answers

StephenLee

07/29/25 3:24pm

The solutions for transmission oil and radiator oil mixing are as follows: 1. For automatic transmissions: The automatic transmission cooler shares the radiator with the engine coolant radiator. This means the radiator's pipes are divided into two separate channels by thin plates—one for coolant and the other for transmission oil. If the coolant used is water or some low-quality coolant with strong corrosive properties, it may corrode and damage the thin plates separating the channels. This can cause the coolant and transmission oil to mix, allowing oil to enter the radiator. In severe cases, it can lead to significant damage to the transmission. Manual transmission vehicles do not route transmission oil through the radiator, so it cannot mix with the coolant; instead, they use air cooling via the oil pan. 2. For manual transmissions: If there is oil in the radiator, it is likely engine oil, indicating a blown head gasket that has allowed the engine's coolant and oil passages to connect. This requires immediate sealing and repair.

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