this was just discussed about a week ago so do a quick look and you'll see the posting with a lot of pictures.
http://www.automotiveforums.com/vbul...d.php?t=928508
The cost quoted seems really low. I know the previous poster who did the work himself quoted some 12 or so hours of work so something is mixed up.
If you aren't driving the van daily I'd do a quick oil change, collect a sample and send it to
http://www.blackstone-labs.com/. They'll do a quick analysis of the oil and let you know what's up. It's a great service and the cost is minimal.
As for the white milky stuff under the cap, it's likely normal, assuming that it's only there. When I look under my cap during the cooler months I tend to get a bit too. You may need a new cap as it could be leaking.
Keep us informed of how this plays out1