Hi there!
This isn't going to be good news Im afraid. These symptoms are typical of head gasket failure.
Head gaskets can fail on one of 3 ways -
#1 Rupture to outside from cylinder - Lots of oil, steam, fire maybe - it's pretty obvious.
#2 Rupture from cylinder into an oilway - You burn lots of oil, blue smoke, lack of power, oil forced out of fillercap, dipstick, air filter gets black.
#3 Rupture from cylinder into coolant channel. You use water - but no leaks under car. White steamy exhaust on starting, Coolant overheats quickly and appears to boil. Inspection of coolant is sometimes oily.
Yours sounds like #3
It probably needs the cylinder head off and the gasket replaced. Quite a time consuming job, but DIY-able with the correct tools.
You can check the compression of the cylinders first just to make sure it is this and not leaks somewhere else -
Check out
PetesPonies post on the mustang forum about leaks around the intake manifold. It may be easier to check this first.
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