what is the yellow gunk on inside of engine oil fill cover

tcpoob

New member
did an oil change this afternoon.

experts, what's the yellowish goop there on the inside on 5w30 engine fill cover? never flipped it around or noticed it before.

2005 v6 4wd about 145,000 miles thanks
 

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i attached two pictures but the links are broken. maybe it's a glitch from the relocation of the web service.
 
http://www.toyota-4runner.org/4th-gen-t4rs/15865-sludge-underneith-oil-cap.html

found a similar thread, suggesting the sludge may be condensation in filler neck, moisture, caused by short trips etc...

in that case, i am not too concerned.
 
http://www.toyota-4runner.org/4th-gen-t4rs/15865-sludge-underneith-oil-cap.html

found a similar thread, suggesting the sludge may be condensation in filler neck, moisture, caused by short trips etc...

in that case, i am not too concerned.

You are correct, its cause by short trips, engine not warming enough to evaporate it. I had some acum. on the cap on my last oil change, because I only drive 2 miles to go to work in the morning.
 

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