# 2000 Sienna Sludge?

**URL:** <https://community.cartalk.com/t/2000-sienna-sludge/6741>\
**Category:** Maintenance/Repairs\
**Created:** [November 2, 2007, 8:34pm UTC](https://community.cartalk.com/t/2000-sienna-sludge/6741 "2007-11-02T20:34:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![virginiajim](https://avatars.discourse-cdn.com/v4/letter/v/67e7ee/32.png) [@virginiajim](https://community.cartalk.com/u/virginiajim)\
**Post date:** [November 2, 2007, 8:34pm UTC](https://community.cartalk.com/t/2000-sienna-sludge/6741/1 "2007-11-02T20:34:50Z")

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2000 Toyota Sienna with 118,000. When i remove the oil cap the exposed metal is coated in a hard black substance. is this a sign of sludge? the car doesnt exibit any of the signs of a sludged engine. Toyota checked the engine and confirmed that there was no sludge. what is this stuff? should i be concerned?  
  
 Thanks!