sludge under oil filler cap - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
![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 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](https://www.tahoeyukonforum.com/data/attachments/302/302525-1b73a1a949ac28e3f80272aab29584c8.jpg)
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
![Engine Sludge Causing Smoking on Starting - Can it Be Fixed? - Maintenance/Repairs - Car Talk Community Engine Sludge Causing Smoking on Starting - Can it Be Fixed? - Maintenance/Repairs - Car Talk Community](https://global.discourse-cdn.com/cartalk/optimized/2X/e/ea64b31004f8804b37dadee6a1bc004508a5af26_2_666x500.jpg)
Engine Sludge Causing Smoking on Starting - Can it Be Fixed? - Maintenance/Repairs - Car Talk Community
![1998 ES300 first oil change! (Found sludge under oil fill cap?) - ClubLexus - Lexus Forum Discussion 1998 ES300 first oil change! (Found sludge under oil fill cap?) - ClubLexus - Lexus Forum Discussion](https://cimg6.ibsrv.net/gimg/www.clublexus.com-vbulletin/2000x1504/img_20200821_135142313_6127cbbca0c3cd4e3d412413e09b6e9860e4e801.jpg)