1. Oil cooler failure: The oil cooler is a device that helps to keep the engine oil cool. If the oil cooler fails, it can allow oil to leak into the radiator.
2. Faulty oil filter: A faulty oil filter can also allow oil to leak into the radiator.
3. Cylinder head gasket leak: A cylinder head gasket leak can allow oil to leak into the radiator if it develops between the oil and water channels of the cylinder head.
4. Cracked radiator: A cracked radiator can allow oil to leak into the radiator if the crack is located between the oil cooler and the radiator core.
5. Blown freeze plugs: Freeze plugs are used to seal the openings in the engine block that are used for coolant circulation. If a freeze plug blows out, it can allow oil to leak into the radiator.
If you are unsure of the cause of the oil in the radiator, it is best to have the vehicle inspected by a qualified mechanic.
