This LO has been revised to comply with DA programing to extend intervals and conserve
lubricants. When practicable, lubrication services will be made to coincide with the Vehicle
"S" Preventive Maintenance Service. For this purpose, a 10% tolerance (variation) in
specified lubrication point mileage is permissible.
If water or metal particles are detected during crankcase
draining and filter element changing, notify Direct Support
Maintenance Personnel before refilling crankcase.
dipstick slowly to ensure accurate reading. There are two marks
on the dipstick, H (HIGH) and L (LOW). The quantity of oil required to
raise the oiI level from L (LOW) mark to H (HIGH) mark is approximately
7 quarts (6.6 liters) for M939 and M939A1 and 4 quarts (3.6 liters) for the
oil filter element each time crankcase is drained. Fill crankcase
with engine oil.
M939 AND M939A1 SERIES VEHICLES
Oil Filter Capacity
4 quarts (3.8 liters)
23 quarts (21.8 liters)
M939A2 SERIES VEHICLES
Oil Filter Capacity
18 quarts (17 liters)
2 quarts (1.9 liters)
engine and visually check for oil leaks at drain plug and oil filter case.
Stop engine and allow approximately one minute for oil to drain back into
oil pan; recheck oil level with dipstick. The dipstick is equipped with a seal
which fits into the opening of the dipstick tube. The seal is seated within
the tube and must be turned counterclockwise to be released before dip-
stick is withdrawn. Turn clockwise to seat after oil level has been checked
and dipstick installed.
not hold oil samples. Submit oil samples as soon as they have been
Sample oil every 60 days or 1,000 miles ( 1,600 kilometers). Army Reserve Units will sample
every 120 days or 1,000 miles (1,600 kilometers). Oil will be changed only when directed by
oil analysis laboratory. When AOAP laboratory support is not available, change oil and filter
element each 6,000 miles (9,600 kilometers) or 6 months, whichever occurs first.
Bring engine up to operating temperature and remove drain plug from oil pan. Inspect for
presence of metal particles and water while draining oil into a drainage container. Allow
sufficient draining time so that all oil has time to drain. Install drain plug and tighten to
60-70 lb-ft (81-95 N*m).
Seasonal oil changes will be made due to expected temperatures.
See the key on card 2.
CARD 29 OF 33