Yellow gunk on oil filler neck
#1
Rennlist Member
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Yellow gunk on oil filler neck
I just pulled the cap off the oil filler neck to add oil to my '02 996 and found yellow gunk on the inside of the cap and top of the filler neck. Any ideas what this is?
#2
Instructor
Join Date: Dec 2011
Location: Maryland's Eastern Shore
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You could search this topic. We have seen this before. I recollect the majority opinion is that this is moisture and oil additive residue that collects on the filler and cap in very cold weather. I saw it on my 2000 Carrera, wiped it clean, and never saw it again in 3 years.
#4
Race Director
emulsification of oil and condensate at the highest point in the engine. Typical in cold weather with short trips. Nothing to worry about, but take it for a longer drive every once in a while to burn off any water.
#6
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Take longer trips!
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#9
Race Car
Join Date: Sep 2006
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Get a new o-ring for the oil fill cap too. A better seal will reduce any chance of moisture getting sucked by and collecting into the fill tube there. Moisture is going to collect there regardless though.