Recently changed my oil and today I was doing a routine check and noticed some white sludge under the filler cap. Doesnt have a smell other than oil so not sure what to make of it truck has been running fine coolant level is good and there was no coolant in my oil when I chaged it? any ideas running 5-30 synthetic in a 99 5.4 130,000

 

https://www.f150online.com/forums/sh...ghlight=amsoil

Check this discussion, I think you'll find what youre looking for.

 

dont worry about that. its just normal condensation.

 

Comes up at least once a week in the wintertime. People.... please search before posting.

-Joe

 

I did a search and nothing came up. But thanks for the info !