90 mark 7 oil returns plugged also leaking oil from rear main and or intake?

Okay, so you have a mark 7, so you're pretty much FUBAR for as much as Ford cares so you might as well go with my crazy theories.

First, we'll fix the problem of plugged oil returns:
1: Do an oil change.
2:Pour 2 tablespoons of Dawn dishwashind detergent and 1 quart of Mercon transmission fluid into your oil fill. Run (at idle) for 5 minutes twice daily for about a week. If this doesn't help, throw some reman heads on there.
3: Do an oil change again

Now for the oil leak. Replace the leaking gasket or seal.

Answer

i have the same issue. i replaced BOTH pcv valves,leAk has slowed down and it can breath now. i believe it is the rear intake and am looking 4 more info

check the inlet for the pvc system at the intake if its stopped up it will cause it to

leak at the rear oil seal.

First answer by ID0000000000. Last edit by JohnJa. Contributor trust: 301 [recommend contributor]. Question popularity: 49 [recommend question]