Komatsu PC308USLC-3E0 Operation & Maintenance Manual page 262

MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE
6. After replacing the filter cartridge, open the engine hood and
add engine oil through oil filler (F) to between the (H) and (L)
marks on dipstick (G).
7. Run the engine at idling for a short time, then stop the engine
and check again that the oil level is between the (H) and (L)
marks on dipstick (G). For details, see "Check Oil Level in
Engine Oil Pan, Add Oil (PAGE 3-72)".
8. Install cover (1).
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MAINTENANCE MAINTENANCE