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white smoke out the tailpipe and the smell of anti-freeze in the exhaust gas. an engine that over heats either only at highway speeds or town driving, when all other things like, rad cooling fan working properly, thermostat is working properly, no external coolant leaks. the spark plugs may show signs of coolant on them. just some things that are indicators.
Could be a leaking cylinder head gasket or a small crack in the cylinder head. Is the head aluminum? Make and mileage of the vehicle will sometime help as some vehicle makes are notorious for head gasket problems. This allows coolant into the oil and causes this goo on the inside of the cap. Have a trustworthy shop check it out to be sure.
did you check the water pump for leaks if you do not see coolant on the floor a good posibility you have a head o head gasket problem, first check for the obvious like coolant reservoir, cap, water hoses for any leaks: Remove oil filler cap and inspect if it has a white milky goo on it inside filler cap then you have a head gasket leak
Normally your oil will have a light chocolate color to it and this usally indicates a busted head gasket or cracked head if you are only seeing it inside the oil cap I wouldnt suspect it I have seen oil caps that develope this light chocolate or creamy color on the underside of them and can only attribute it to condensation being built up on the underside of the cap mixing with whatever little oil is on the cap usally changing the cap takes care of this I hope this helps you in some way.
if it has been over heated, problem is head gasket... When it's cold, remove the radiator filler cap.... watch for bubbles, and look for heavy sweet smelling exhaust (this is not always typical). You also may just have alot of blowbye oil.... especially considering the mileage... i would recommend a quality remanufactured long block
Sounds like a blown head gasket. Try running it with the cap off,while COLD & see if coolant starts pumping all over the place. Do not do this while hot!!! Serious injury will occur. The other way is if you have access to an emission tester you can stick the sniffer just above the coolant in the radiator & if you get a co reading,you got a bad head gasket. Lastly, check the oil dipstick & filler cap for white goo,dead give away for a head gasket.