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2004 - 2008 Ford F150 General discussion on the 2004 - 2008 Ford F150 truck.
Old 01-30-2015, 01:07 PM
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Issue: Yellow sludge on oil cap

Yellow/white sludge build up on the oil cap may seem scary at first. When you dive into the issue it isn’t too big of a deal and isn’t a cause for much concern.

This issue can be caused by:
  • Engine fluids not getting to temperature
  • PVC value isn’t working right and needs replacement
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Yellow sludge on oil cap solution?

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Old 02-04-2012, 05:12 PM
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Check your PVC to make sure it's working right and venting the gasses. If they aren't venting, inlcuding steam, that could cause the foam too.
Old 01-25-2015, 12:23 AM
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Default pcv valve

Originally Posted by frantic29
Was cleaning under the hood the other day and pulled the oil cap off and noticed yellow/white sludgy stuff under the cap. Freaked out came in here and noticed the #1 culprit is not letting the engine fluids get to temperature. This makes perfect sense for me. I moved not too long ago and only have a 3 mile drive to work. When it is super cold out my temp gauge sometimes doesn't get to the normal operating range. It generally does but not always but even then it's only there for maybe 1.5 miles before I shut it off again. So hardly enough time to really get all the oil circulated and heated up.

How serious of a problem is this? I can adjust my route to work to add some time to let the fluids warm up but I don't want to add so much that I am going to go way out of my way and add a bunch of gas to my bill. That was one of the perks of moving where I did. Any other suggestions for this problem besides just running the truck longer.
i had the same problem ..i change the pcv ..or pvc . valve and the white sludge is gone ...like a 3$ dollar fix



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