If there is motor oil in the antifreeze reservoir there is a good chance there is also antifreeze in the motor oil. This condition is probably the result of a bad head gasket or a cracked head. Antifreeze mixing with motor oil is a recipe for disaster for the engine. Have a trusted mechanic diagnose the situation soon as possible to hopefully avoid even more costly repairs.
If it is motor oil in the anti freeze, then it is either a cracked head, cracked engine block, or a head gasket blown. If it is transmission fluid in your antifreeze, then the radiator is leaking from the transmission cooler ----- although usually that would cause antifreeze to be in your transmission fluid.
Cracked head or a blown head gasket. good luck.
A bad head gasket is the most common cause of antifreeze mixing in the oil. The antifreeze will dilute the oil and it will eventually cause your engine to seize up.
Oneway is to stick a water hose in the reservoir and turn the hose on about 1/3 pressure. This will flush out the majority of the oil. Now put a small amount of dishwashing detergent in the reservoir and with an object swirl it around inside the tank. Flush it again with water hose until all soap and oil are gone. Now siphon out the water and fill to full with a 50/50 mix of antifreeze and distilled water. Or you can remove it and clean it out if it is easy to remove.
It's going to look like your power brake reservoir. It is the reservoir for your clutch slave cylinder.
Theres to much water in your reservoir bottle, theres a mark were it should be filled up to, any more and it will flow over.
Are you sure that isn't antifreeze and if so that would indicate the radiator is defective. There is a transmission oil cooler in the radiator.
When antifreeze is poured into your oil, it weakens your oil cause it to break down prematurely and can cause your engine to fail by spinning an engine bearing and even smoke. This is also a sign of a blown head gasket.
Not as long as you put the proper fluid into the proper place such as, motor oil into the engine, gasoline in the fuel tank, antifreeze in the cooling system reservoir, transmission fluid in the transmission, brake fluid in the brake system reservoir, power steering fluid in the power steering reservoir, windshield washer fluid in the windshield washer fluid reservoir and don't forget to put blinker fluid in the blinkers! :)
There are a couple of things that can cause oil to get into your coolant reservoir. A blown head gasket or a broken piston ring are the most common causes.
That's usually a good place for it, as well as the overflow reservoir. It wouldn't do you much good to put it in the windshield washer reservoir, the oil pan, or the fuel tank, after all.