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[Joe Mc]

From the Ford TSB on oil burning:
OIL DIPSTICK (6.9L) - ENGINE OIL LEVEL CHECKING PROCEDURE

LIGHT TRUCK 1983-86 E AND F SERIES
In order to measure engine oil levels consistently and accurately, it is useful to employ the following recommendations:
 Park vehicle on level surface. Low oil level readings will be obtained if the vehicle is sloped away from the dipstick.

 Have engine at normal operating temperature as oil expands at the rate of one percent per 25~F (14~C) change and the dipstick is calibrated to the engine at normal operating temperature. In addition, allow at least a fifteen (15) minute engine shutdown period to assure that oil contained in the upper parts of the engine has returned to the oil pan.

 Have dipstick loop directed inboard as this eases installation and minimizes wiping action on oil level gauge.

 Read oil level on both sides of gauge and use highest level (reading) for the actual engine oil level.

Correct oil dipstick calibration can be verified by draining the engine oil and filling the engine oil pan with nine (9) quarts (8.5 liters) of oil. When the oil dipstick is properly seated, correct dipstick calibration is indicated if the oil level is within 1/16 inch of the "Full" mark.

NOTE: The area between the "Add" and "Full" marks represents two (2) quarts. As long as the oil level is between the "Add" and "Full" marks, no oil should be added. When the oil level does reach the "Add" mark, only one quart of oil should be added. If the oil level exceeds the "Full" mark, oil consumption could result.