1
Worn piston rings
Reciprocating
CheckOil-fouled discharge; blow-by from crankcase breather.
FixReplace rings; hone or replace cylinder if scored.
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2
Overfilled crankcase
Reciprocating
CheckDipstick or sight glass above max.
FixDrain to correct level.
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3
Wrong oil (too thin)
Reciprocating
CheckCompare to OEM spec.
FixDrain and refill with correct grade.
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4
Tilted installation
Reciprocating
CheckLevel the unit with a bubble level.
FixRe-shim base; install on level pad.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.