I read about sludge on my 4.7 and i changed to synthetic amsoil and amsoil filters. i change oil once a year and have had no problems with sludge buildup

the thermostat I have in is from auto zone. I just did an oil change the other day and there was no sludge coming from the drain plug. so wat are some things I can do to find the cause of this

00DakDan gave you the best answer its normal but can be a bad head gasket especially with the 4.7.

Sludge/muck in the filler spout is common except out west the weather is not conducive to form it unless you live where it snows gets very cold.

ok wat are some things I can do on finding out wats happening.

How does the oil look when you drain it, or on the dipstick?

it loos normal the sludge is only in the filler tube, pcv line, and in the breathers

You can rent a head gasket tester from the auto parts store. Will only cost you the fluid if you bring it back. The fluid is around six bucks.

How it works...

If it's only in the PCV system and the fillers then it is likely NORMAL.

Ya so far from wat i have seen its only in the those three places then is there a way to prevent that from continuing

If it's due to the lack of engine run time, I'd just make sure the engine runs longer and gets hotter to boil the condensate out.

Or, you could move to someplace where the relative humidity never goes high enough ... say, the middle of Death Valley *grins*

(That's a, I say, that's a joke son!) /Foghorn_Leghorn_Voice

RwP