Daewoo DE12TIA - Oil Pressure too Low; Oil Deteriorates Quickly

6.3.4. Diagnostics and troubleshooting
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MAINTENANCE OF MAJOR COMPONENTS
Complaints Possible causes Corrections
1. Oil consumption
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Poor oil
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Use suggested oil
excessive
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Oil seal or packing leaky
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Replace
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Pistons or piston rings worn
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Replace pistons and/or
piston rings
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Cylinder liner worn
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Replace cylinder liner
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Piston rings sticking
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Replace pistons and/or
piston rings
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Valve guide oil seals or valve
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Replace
guides, or valve stem worn
2. Oil pressure too low
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Poor oil
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Use suggested oil
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Relief valve sticking
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Replace
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Restrictions in oil pump strainer
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Clean strainer
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Oil pump gear worn
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Replace
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Oil pump feed pipe cracked
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Replace
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Oil pump defective
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Correct or replace
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Oil pressure gauge defective
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Correct or replace
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Various bearings worn
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Replace
3. Oil deteriorates quickly
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Restriction in oil filter
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Replace filter element
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Gases leaking
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Replace piston rings and
cylinder liner
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Wrong oil used
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Use suggested oil