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check manifold gaskets for leaks, check vacuum hoses for leaks. check the transmission oil condition ( auto tranny)
if it is an auto then it may require the pan to come off and check for mechanical fault.
Does the exhaust smell sweet -like ? Do you see steam after the warm-up period ? Its a Northstar engine ? That stuff doesn't just dissapear .. there something loosing it... How do you know theres no head issues ? Head gasket leaking into a cylinder, they are famous of that kinda stuff ...
If your car is losing oil, and if there is no evidence of oil leaking, there is no question that it is either losing it through piston rings or through the head (head gasket or valve guides).
Best thing to do is use a HEAVIER WEIGHT oil than specified for the vehicle when new, regularly monitor your oil level and be sure it never falls below one quart low, and consider having the engine overhauled when you start noticing a performance deficit or hear mechanical noise (such as rod knock) from the engine.
Try to add the recommended coolant sealant from the dealer. If this doesn't work then mechanical repair will be required.
For instance, I have a 1997 Cadillac Deville Limousine that I acquired, and it was leaking antifreeze through the o-ring of the water pump. Replacing the water pump was indicated and did so. But, after that the head gasket was leaking as indicated by a miss and fog coming out of the tailpipe. I repaired that problem by adding a $30 can of Bar's Leaks Head Gasket Repair, the kind that doesn't require draining the coolant system. That did the trick, and haven't had a problem since (for 3 months now).
Where is your coolant leaking from? Is the system within normal operating temperature?
Sounds like an oil seal or manifold gasket. If you don't see oil in your driveway, the oil is burning off in the engine and this would cause the misfire if it's getting to the sparkplugs. Take a flashlight and look under the hood for any small pools of oil near the sparkplugs. I'd go to a different dealership for service and I'm willing to bet they'll confirm an oil seal or gasket problem. Best of luck with your problem.
Head Gasket problems are common on the 4.6. It is an expensive repair, because the engine has to come out and all the head bolt holes have to be retapped. Check it for leaks first. Check the water pump and water pump housing to cylinder head gaskets.