03 E350 oil in coolant tank. 5.4L 213K miles
 

New member. Had oil changed a week ago at a local shop. Drove to a job 250 miles away, when I got back noticed a pool of oil under van. Took it back and they told me I had a bad seal on filter. They replaced filter, filled oil and sent me on my way. Later that afternoon I noticed an oily goo leaking from my coolant res tank. Parked van, then had to go out of town for another week. Motor ran fine, noticed no obvious problems.
Getting back in town in a few days and will get more info (compression, etc.) but thought I would check to see if anyone has any ideas other than head gasket? Van has been running perfectly, no signs of developing issues. I do remember when they replaced filter the second time that the van did rock a little like they were testing or tightening something pretty hard. Thanks