TM 10-3930-671-24 TMD27 (2.7 L) Engine Oil Level Do  not  add  oil  until  oil  level  approaches  the  low  mark. Then  add  only  enough  to  bring  it  to  high  level  NEVER above.  Do not operate the engine with oil level below the low level mark or damage to equipment may result. Check the oil level with engine stopped. Allow 5 minutes for  the  oil  level  to  stabilize.  Oil  level  should  be  at  the upper level marking (MAX) on dipstick. Add recommended  oil,  as  needed.  Wait  for  5  minutes  after adding   oil   and   check   the   oil   level   again.      DO   NOT OVERFILL. Engine Oil & Filter Change It is recommended to: • Drain and replace the engine crankcase oil every   50   to   250   operating   hours.   See NOTE below. • Replace  the  engine  oil  filter  at  every  oil change. • Drain  and  replace  engine  oil  in  a  new  or rebuilt  engine  after  the  first  50  hours  of operation. • Drain   old   oil   after   truck   has   been   in operation    and    engine    (oil)    is    hot    (at operating temperature). NOTE Do not exceed 250 hours. The time interval for changing engine    oil    will    depend    upon    your    application    and operating conditions. To determine  the  correct  schedule for your truck, it is suggested that you periodically submit engine    oil    samples    to    a    commercial    laboratory    for analysis of the condition of the oil. Refer  to  Section  4.1,  Engine  Oil  and  Filter  Change,  for additional information. 1. Remove drain plug at bottom of oil pan and drain the oil completely. 2. Remove the old oil filter. 3. Install new oil filter. Follow installation instructions  printed  on  the  filter.  Check  that  O- ring seal is oiled and correctly in place. 4. Install  drain  plug  and  refill  crankcase  with  fresh engine   oil   through   the   rocker   cover   oil   filler opening. 5. Wait  5  minutes  after  adding  oil  and  then  check the oil level. 6. Start  the  engine  and  allow  it  to  run  at  idle  for several  minutes.  Check  the  oil  filter  and  drain plug   for   leakage.   Recheck   oil   level   as   noted above. Refer to Section 2. 1, Service Specifications, for engine oil specifications for your engine model. OIL  PERFORMANCE  DESIGNATION  To  help  achieve proper    engine    performance    and    durability,    use    only engine  lubricating  oils  of  the  proper  quality.  These  oils also   help   promote   engine   efficiency   which   results   in improved  fuel  economy.  A  symbol  has  been  developed by  the  API  (American  Petroleum  Institute)  to  help  you select the proper engine oil. It should be included on the oil   container   you   purchase.   For   diesel   engines,   it   is recommended  that  you  use  API  Service  Classification CD, Service Class D motor oils. Recommendations For Engine Oil Viscosity Ambient Temperature (Average) Viscosity 80°F or above (300C or above) SAE 40 32° to 110°F (0° to 430C) SAE 30 70° to 0°F (21° to -170 C) SAE 20W 0° to -30°F (-17" to -34"C) SAE 10W Engine Fuel System Diesel 1.    Clean and inspect the fuel filler cap and seal for damage,  correct  sealing,  and  function.  Be  sure the air vent in cap is open. 2.    Inspect  the  fuel  system  components  and  lines for condition and leakage. 3.    Remove  and  inspect  the  engine  fuel  filter,  if  a problem  with  fuel  flow  has  been  reported.  Test fuel  filter  for  fuel  flow  restriction  and  clean  or replace the filter per PM schedule. Brake Fluid Reservoir NOTE Use  SAE/Type  DOT  3  or  Equal  Hydraulic  Brake  Fluid only. Refer to Specifications. Check  the  brake  fluid  level  in  the  reservoir  mounted  in cowl.  The  FULL  level  is  at  the  top  ring  on  reservoir. Clean the cap and top of reservoir before removing cap. Add recommended fluid, as needed. Refer to Part 8, Brakes, for additional information. F-51