A Cracked reservoir Cap would in most cases cause your car to over heat. After your car has ran a while, and built up pressure it would begin to loose water in the form of steam. Once your car is parked and shut off it will then begin to loose water. Once parked your car looses compression which causes the water to boil instead of steam. You would then loose water at a faster rate emptying your radiator and causing your car to run hot.
no
Sounds like the rubber line on the bottom of reservoir is leaking or tank is cracked CHECK IT OUT.
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.
A leaking radiator hose would NOT cause this to happen, you have 2 problems with this vehicle.
Not Unless You Allow Enough Coolant Loss To Overheat Engine. If Your Reservoir Isn`t Leaking Too Bad Keep A Watch On Your Water Level You Will Be OK. But If You Have Decent Weather You Can Remove The Reservoir, Clean It Up. At a Parts House Buy A Two Part Epoxy (clear) Apply It To The Hole Or Crack On The Tank Allow It To Dry. Put It Back On Good As New. GOOD LUCK
A leak in the braking circuit is a likely cause.. Brake fluid leaking from a poorly tightened joint etc - will cause the level in the reservoir to fall - causing the sensor to trip the warning light.
A leaking heater core will cause the engine to overheat because the coolant is leaking out.
Are you sure it's oil? Most likely is engine coolant from the radiator. Next would be transmission fluid. Or it could be from the reservoir holding the windshield washer fluid. Oil from the front is unlikely.
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.
It would cause excessive mud and the swimming pool would sink slightly. It would only cause a sinkhole if there was a hole underground under the pool.
A leaking fuel rail is the normal cause.
No It would not unless beside that plenum on your block is a crack in your heads and your leaking coolant or even leaking internally check head gaskets