Why is there oil in my car's radiator?
Oil in the car's radiator is a common problem that can be caused by a few different factors. The most common cause is a leaking head gasket, which is a seal between the engine block and cylinder head that can be damaged over time. Another possible cause is a leaking oil cooler, which is a device that cools engine oil and helps keep it at a consistent temperature. Finally, an oil change that was not done properly could lead to oil entering the radiator. In any case, the presence of oil in the radiator should be addressed immediately, as it can cause damage to the cooling system and reduce the car's performance.