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Black sludge in oil cap?! Does anyone know if this is normal?? : r/G35
If I look under the engine oil cap and see a sludgy mess instead of regular oil, do I need an oil change? - Quora
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Light brown gunk on oil cap? - MBWorld.org Forums
Tested engines】 Used engine checkpoints ～ engine sludge ～ – Used Engines/Used Auto Parts from Japan!
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Brown Sludge on oil filler cap and dipstick
Brown Sludge on oil filler cap and dipstick
Gunk under my oil cap | GMC Terrain, Equinox, and SRX Forum
What Is the White Stuff Under Your Oil Cap? | The Drive
Dirty oil filler cap - brown sludge???? | BimmerFest BMW Forum
Yellow sludge on oil cap and fill tube - Ford Truck Enthusiasts Forums
Noticed a rusty orange color inside oil cap and down filler tube. | Chevy Tahoe Forum | GMC Yukon Forum | Tahoe Z71 | Cadillac Escalade - Tahoe Yukon Forum
Black sludge under oil filler cap,advice needed! | VW Golf R32 Forum
Sludge underneith oil cap - Toyota 4Runner Forum - Largest 4Runner Forum
Audizine Forums
Freaking out right now - A good amount of sludge under cap - BMW 3-Series (E90 E92) Forum
Sludge on oil Cap - LS1TECH - Camaro and Firebird Forum Discussion
Gummy Oil Buildup on Oil Cap (pics) - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
