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Randall C
Randall C, ASE Master Tech
Category: Cadillac
Satisfied Customers: 12718
Experience:  ASE Master Tech, 32 years exp,Cadillac 6 yrs
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2003 cadillac cts . oil in radiator

Customer Question

2003 cadillac cts . oil in radiator
Submitted: 6 years ago.
Category: Cadillac
Expert:  Randall C replied 6 years ago.
Hello, there could be one of several reasons for seeing oil in the rad. the most common is actually trans fluid.This occurs when a problem develops with radiator and the trans cooler portion leaks into the engine coolant within the radiator. If it winds up truly being engine oil, then the second most common for this is a bad intake manifold gasket. This engine did have known intake manifold problems. lastly, and the least likely could be a headgasket problem. Oil can? get into coolant asside from coolant i oil if headgasket is failing. To isolate the problems can be difficult. You first need to determine which fluid is dropping from level. If trans fluid is dropping slightly, then bad radiator. If oil is dropping, the first step would be remove intake manifold and inspect internally and the gasket as well for any breaks.