I am thinking about changing my oil pan gasket because I have a bad leak. Right now I am just eliminating things that I think it may be. I have change the valve cover gaskets but the leak persist.

 

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Leak detection 101: Degrease and clean engine with degreaser, power washer (self serve spray wash) and repeat. When all the crud is gone, let dry. Drive a mile or more, then get under it with engine running with a bright light and LOOK for your oil leak.

 

Define what you call a bad leak. People need more specifics. I consider a bad leak of something I can measure in drips per minute. If it's wet but not leaving evidence of a drip, I call that nominal seepage.

Clean as detailed above, starting at the top the possibilities are the valley cover gasket, oil pressure sending unit, valve cover gaskets, camshaft position sensor on the 6.0, crankshaft position sensor, front engine cover, rear engine cover, oil cooler block and finally you're down to the oil pan.

 

Also check the oil cooler lines and where they enter the block. You can put some dye in the oil and check for leaks with a UV light.

 

Great piece of advice ....

Also toss the rear main seal in to the possibilities if never been done.... I did oil pan gasket at about 140k along with the rear main. Did the oil cooler lines about a year ago. Did the front crankseal about a year ago also. Oil leaks make me mental.....the advice about the dye is the best solution. Just degrease everything prior. I will toss this additional piece of advice- Remove the skid plate and just leave off until you get resolved... Will help you really get a good look at where the dye shows up & helps when you clean it. Not a big deal to remove. Good luck and follow up on your discovery/discoveries...

If you do pull the pan- read up on the oil pump oring (off memory)- Think its a worthwhile thing to do while you have pan off. If memory serves me right, it hardens and can possibly create low oil pressure upon start (again I may be wrong, thinking it was something along that). So, if you do pull pan- do that, replace the oil cooler lines and the front & rear seals.....Also, get some fresh wire loom to replace the most likely degraded existing wiring harness loom.