After reading another post I decided to pull my crossover pipe (from the turbo to intake). I found about a 1/4 inch build up of nasty black goo. Also, there was a small drool of oil laying on the top from where the up pipe comes up of the tubro into the crossover.
I scraped the goo off with a screwdriver and it has the consistency of cookie dough.
Some questions I have:
1. Do I need to pull the intake completely and clean it?
2. Do I pull the EGR or disable it?
3. Could this affect mileage? I run 60 miles a day to and from work (all highway) and some around town. Last tank I only got 25 mpg. Some folks say I should be pushing 30.
See pics attached.

Picture 1 - is that the waste gate?
Picture 2 - is that the EGR valve?
Picture 3 - this is the crossover pipe that I removed
Picture 4 - is the goo removed

Suggestions? Recommendations?

Attached Thumbnails

       

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86 300SDL. 250,xxx on #14 Head. One eye always on temp gauge.. Cruising towards 300K