MY ENGINE IS OVER HEATING AND ANTIFREEZE IS MIXING WITH OIL

SOURCE: oil mixing with antifreeze!

If oil is brown, the problem is a blown head gasket. In that instance, do not drive the car or you will damage the engine bearings. If oil is reddish, then the transmission cooler in the radiator has failed. Again, don't drive or trans will be damaged. Usually there will also be signs of antifreeze in the engine oil with a head gasket failure. If you just bought the car, the oil you see in the radiator may be a sealant added to stop a radiator leak. However, the condition should be verified to make sure that it is not from either of the failures I listed. Testing is far cheaper than a new engine!!!
Good luck

SOURCE: Overheating, boil over when I turn on the heat

Okay! So what I did was cut my car completely off for two days, I drained the radiator by unplugging it, I took the water hose and just let the water flow in and out from the coolant housing under the hood in the right hand corner, I also let the water flow into and out of the radiator, I plugged the radiator back up after just a few clear coats of water flowed through, I filled with 1 1/2 containers of Peak 50/50 Antifreeze/Coolant. I later in the day noticed that one of my fans were out and the other one wouldn't stay on. I ran a kill switch from the inside to the fans, only one is working due to the motor on one of them but I can guarantee that my car hasn't over heated or ran hot since I did this coolant flush. And also when you put the new coolant in make sure that the car is excessively cold. If your fans aren't spinning then that's another reason. I wish you luck.

SOURCE: i have oil mixing with antifreeze in my 1997 toyota corolla

most of the time this fault is due to a head gasket been faulty.

SOURCE: 2000 oldsmobile Silhouette engine over heating and

These two problems are related, your engine is overheating because there isn't enough coolant to dissipate the heat. There are three main causes for coolant in the engine oil:

1. Cracked head
2. Blown head or intake gasket
3. Cracked block.

The gaskets are an easy and relatively cheap fix, the head replacemnet isn't to difficult but will run you more than the gaskets. If the block is cracked (pretty rare) you'll need a new motor because it's going to comletelyu fail sooner or later.

SOURCE: motor oil spewing onto the engine

Unfortunately, this sounds like you have a bad head gasket. The motor oil is most likely mixing with the antifreeze as well. This also explains the antifreeze leak.

I wish I had better news for you! :(