I have a 2001 Saturn L. Oil is leaking, it is not the head gasket. Tore engine apart and replaced gaskets. Stopped leaking for about 6-7 months and it started to leak again. Did oil change last week and needed to add 1/2 qt today.

This is common issue early sign head gaskets failure for EJ251 SOHC engine for external coolant leak. Second gen 96-99 with EJ25D is worst because when head gaskets failed, it's an internal leak that allows coolant and oil mix together in the combustion chamber to destroy engine.
You can drive it for at least 6 months or more as long as you keep top up coolant since the leak should be small at a slower rate leak. I drove mine for a while before change head gaskets. You're looking at `$1000-1200 job a dealership since you might as well change the timing belt, water pump, idlers while engine is pulled to replace head gaskets.

you should replace gasket head and base and the rings since you got it tore down as for as a manual chiltons has one

good engineering practice dictates that the head should be skimmed flat and new head studs used
further more the stud holes should be cleaned with a thread tap and then blown dry to remove all oil and water

You have a cracked or leaking engine head gasket.

For leaking head gasket it has to be replaced.For head gasket leaking and other troubleshooting,there are help links provided.Its suggested to click the link below and go through the troubleshooting procedure to confirm the issue :-----Leaking head gaskets? http://schematicsdiagram.blogspot.com/2011/12/leaking-head-gaskets.html
-----------Water in engine oil? http://schematicsdiagram.blogspot.com/2011/12/water-in-engine-oil.html
-----------How to replace head gasket on car? http://schematicsdiagram.blogspot.com/2011/12/how-to-replace-head-gasket-on-1994.html-------------How to know what is faulty Cylinder head or Head gasket? http://schematicsdiagram.blogspot.com/2011/12/how-to-know-what-is-faulty-cylinder.html
-------------- Can I just replace Head Gasket on 1991 Buick Century? http://schematicsdiagram.blogspot.com/2011/12/can-i-just-replace-head-gasket-on-1991.html Location of Head Gasket ?

http://schematicsdiagram.blogspot.com/2011/12/location-of-head-gasket-on-1994-grand.html

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HOW TO REPLACE A HEAD GASKET

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-head-gasket.html

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How to replace Exhaust Manifold?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-exhaust-manifold-on.html

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How to replace Intake Manifold?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-intake-manifold-on-acura.html

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How to replace Cylinder Head ?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-cylinder-head-on-acura.html

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Is it Easy to replace head gasket?

http://schematicsdiagram.blogspot.com/2011/12/is-it-easy-to-replace-head-gasket-on.html

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Should I only replace head gaskets or complete head gasket assembly? http://schematicsdiagram.blogspot.com/2011/12/should-i-only-replace-head-gaskets-or.html
-----------FOR oil leak issue check the following help links:---Common Causes of Car Oil Leaks? http://schematicsdiagram.blogspot.com/2011/12/common-causes-of-car-oil-leaks.html --------Troubleshoot Car Oil leak? http://schematicsdiagram.blogspot.com/2011/12/troubleshoot-car-oil-leak.html
---------Car oil leak?

http://schematicsdiagram.blogspot.com/2011/12/car-oil-leak.html

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Car oil leaks from valve cover gasket? http://schematicsdiagram.blogspot.com/2011/12/car-oil-leaks-from-valve-cover-gasket.html
---------This will help.Thanks.

Hello and welcome to FixYa!

The cylinder head is located on the center of the engine. Yes it can be a worn out head gasket or piston rings. If the piston rings are worn out the oil is burnt that's why it emits white smoke. You will need to replace the head gasket and piston rings.

Hope this helps and thank you for using FixYa! Have a good one!

you need to find that leak, is the leak visible? if its not from radiator or the reservoir, the only other place I could think you can lose water is the head gasket. It happens to high miles and hard driver. 100k miles would likely be a head gasket. Leaking head gasket will also cause the engine temperature to rise and run super hot. antifreeze will leak through the head gasket down to your oil pan mixing oil and water. Check your oil by pulling the dip stick and see if you have oil mix with water; it will have a slimy looking colors, oil is light color and it should never be black. if it black than change your oil and inspect it afterward when the car has been running for while. when engine really hot cause the heat to effect the starter not to engage or start or engine is too hot to run. repairing head gasket could run anywere from 500-800 bucks.

most likely a blown head gasket between a coolant passage and an oil passage not a cylinder . when coolant gets into a cylinder is when you will see the white smoke and the smell.

The head gasket or the intake gasket ,is where to look for the problem.

Sounds like you have a leaking head gasket.