my valve cover gasket is leaking and my top timing cover gasket is leaking, and neither of them contribute to any oil loss (oil loss is negligible). There is another thread here where I talk about disappearing coolant with a picture of the front passenger's side of my engine and the oil slick is substantial, but not enough to lose more than 1/3-1/2 of a quart every 2k miles. Perhaps you are experiencing oil loss somewhere else?

I'll also note that my oil drain plug is not long enough, and subsequently some oil weeps out there too.

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87 300E
202k on the clock