I have no leaks and no black smoke. Primarily on long trips I've lost as much as 3 quarts after 200 miles. Also took a 300 mile trip and no oil lost. Any ideas?

Thanks

 

Someone sneaked in and topped it up between miles 200 and 300?

Seems like heavy use to me, if it is not leaking then it is going through the cylinders and out the exhaust.

 

Yeah 1.5 quarts a hundred miles is a ton of oil to be eating. I agree with transistor, if it is not leaking then it must be going through the cylinders. However with that much oil being burned I would suspect a fair amount of smoke especially on exceleration etc.

I know it is kind of hard to miss a leak like that but be sure it isint leaking from the oil cooler or lines(the oil wont burn here and will only leak under pressure). Also I would check the crank case vent lines just to make sure for some reason it is not frothing up into those lines and getting sucked into the intake.

If you are certain there are no leaks anywhere then it has got to be going into the cylinders somehow. Take a peek at your spark plugs, it will be fairly obvious if they are becoming fouled by oil. Do a compression test as well, it may tell something. I would guess the head gasket has failed somewhere for that much oil to be making it in there.