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If I look under the engine oil cap and see a sludgy mess instead of regular oil, do I need an oil change? - Quora
Tested engines】 Used engine checkpoints ～ engine sludge ～ – Used Engines/Used Auto Parts from Japan!
Audizine Forums
Sludge on oil Cap - LS1TECH - Camaro and Firebird Forum Discussion
slight water condensation / slight amount of spooge inside oil filler cap? | Cadillac Owners Forum
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Yello sludge on oil cap | E46 Fanatics Forum
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Tested engines】 Used engine checkpoints ～ engine sludge ～ – Used Engines/Used Auto Parts from Japan!
Creamy film under engine oil cap? | PriusChat
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Light brown gunk on oil cap? - MBWorld.org Forums
