I have an issue with the oil in my coolant reservoir. Being foolish I changed the radiator instead of just testing it thinking that it was just the coolant line in the radiator, flushed the coolant and thought the issue was fixed. Welp no such luck after driving for about a day I again had hardly any oil because it once again went into my coolant reservoir. What could be some other issues with this model? It drives amazing so I don't think it is a head?

 

Put a block tester on it to see if the head gasket is cracked. The radiator only cools thwre transmission fluid on the actual radiator. The engine has an oil cooler bolted onto it so you might want to check if thats broken.

 

Welcome to the wonderful world of blown head gaskets.

 

Take coolant and oil samples, send them to a local lab for analysis.
Probably a blown head gasket.
Do compression testing too.

 

What engine is this? If it is the 5-cyl, then the oil cooler is possible and is an easy part to check, as well as being easy to replace and cheap too.