Clean or replace
Oil leak
External Internal
Normal
Disassemble cylinder
head(valve stem seal)
Check compression pressureRetighten or replace
Overhaul engine
(piston, cyl. liner)
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6. Excessive oil consumption
Normal
Check oil quality
Replace with suggested lub. oil
Causes according to operating conditions
1. Too high lub. oil level
2. Continuous driving at low speed or
with excessive cold engine
Check oil leakage Check air cleaner
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