My 87 syncro has always has a drip from the drain plug that I have not been overly concerned about. 

However, recently it has really been leaking a lot and I thought it was the plug, wrong!

I thought it was the oil filter or perhaps the O ring behind the oil cooler so I just did an oil change and new filter, I also tightened the nut on the cooler, new fresh oil, started it up and its pouring out from under the van. 

Suggestions?
Oil pump cover? 
Oil cooler O ring blew?

Oil is literally pouring out now when it runs it's like you have a cap off of a quart and are pouring it out. 

Thanks,

Doug