Lubricating oil should be changed on a heavy duty diesel engine when ______．A.It gets dark in colorB.A sample rubbed between fingers feels thinC.It has been in use for a specified intervalD.It no longer supports combustion
Lubricating oil should be changed on a heavy duty diesel engine when ______．
A.It gets dark in color
B.A sample rubbed between fingers feels thin
C.It has been in use for a specified interval
D.It no longer supports combustion
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