You probably cracked your head gasket and now have water or antifreeze mixing with oil. Check under your oil fill cap if it looks like a slimy milkshake cahnces are that's the problem.
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A root apical meristem is protected by a root cap as it pushes through the abrasive soil. The root cap also secretes a polysaccharide slime that lubricates the soil around the tip of the root.
It is a fluid build up on top of the knee cap
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That is do to where the PCV valve is located. The crankcase ventilation system is unable to pull the normally occurring moisture from the area under the oil fill cap so it collects there as that thick slime. 90% of 4.7L's have that problem. It does no long term harm.
A building supply or good hardware store should be able to sell you a toilet cap to bolt in place of a toilet with a good gasket to keep out smells and avoid back ups.
Fluid build up above the knee cap
Put it on the top rack of the dishwasher and wash it with the next load--takes out the stains and smells and keeps its shape too.
The root cap protects the meristem which is the dividing part of the root, it allows the root to push forward into the soil without endangering the meristem. the cells also produce a 'slime' the allows easy movement through the soil.
If the cap is secure, you can keep it indefinitely! Practically, one summer. If it smells "off' or musty, Discard!