RECIPROCATING ENGINE LUBE OILS
Standard oils for reciprocating engines are speciied in Table 3-2.
b. During cross-country lights, use Tables 3-3 and 3-4 for the commercial oil conforming to the grade and
speciication required. Such local purchase oil must not contain detergent additives, but may contain dispersant
additives if replenishing a dispersant oil such as SAE-J1899 ashless dispersant oil is designed to hold newly formed
sludge in suspension. It does not soften or disturb caked sludge which has previously settled out.
SAE-J1966 oil is an alternate for SAE-J1899.
b. In order to prevent clogging by the sludges which may be formed while using SAE-J1966, the following
procedure may be used when changing back to SAE-J1899:
(1) Clean all strainers irst
(2) Add dispersant oil SAE-J1899 to the SAE-J1966 oil already in the crank-case, as needed; these oils are
(3) Check oil strainers every 10 hours for cleanliness over a period of 50 hours operation, and then revert
to the normal oil change schedule.
(4) At scheduled oil change, clean strainer prior to illing with dispersant oil and ground run the engine for 20
minutes. Check strainers for sludge; if contaminated, clean and repeat ground runs until strainers are clean. After
irst light, arid after every 10 light hours thereafter. Check screens until clean.
(5) It is to be noted that the desludging method outlined above is not a purging procedure, but a gradual
(6) If major sludge problems occur that cannot be corrected by the above procedure, contact Commander,
AMCOM, ATTN: RDMR-AEP for a desludging procedure.