I have a 1999 2,5 turbo where the the coolant(in the expansion tank) is brown and oily. The dipstick is fine, no gunk anywhere and the van runs just fine.
I wonder if the oil cooler between the block and the filter can be the issue?
How can i verify if this is the issue without replacing it?
Anyone know where to get a replacement? I cannot seem to locate this part anywhere
Lars