TM 10-3930-669-10 b. Engine Oil Level Service. (1) Unlock two latches (1) and open left-side rear  access  cover  (2)  and  remove  oil  fill cap (3) from engine (4). CAUTION Do  not  overfill  crankcase  with  engine oil   or   serious   damage   will   occur   to engine. (2) Add   oil   according   to   Lubrication   Order (LO 10-3930-669-12) as necessary. (3) Install oil fill cap (3) on engine (4). (4) Check crankcase oil level (Para 3-6.  a.). (5) Close  left-side  rear  access  cover  (2)  and lock two latches (1). 3-13