[Buffalo4]

After a 15 min drive, or similar, to get the engine up to temp, park it and leave the engine running and remove the oil fill cap on the valve cover and see if a lot of air/smoke comes out as this could also indicate a pressure buildup due to a plugged PCV valve. If you have never replaced the PCV valve, you should do it now. PCV and not EGR.

The part is very low cost,esp aftermarket ones if you do decide to go that route,
Or, just spend more and go OEM,.
Buffalo4
PS: I think Odyfamily has had good luck using the AT-205 stuff.

 

[Buffalo4]

The rubber grommet it goes into might be pretty hardened and possibly a little brittle. I changed my PCV valve about 5yrs+ ago and it was OK.
I changed it just for preventive maintenance, not for any other reason.

Buffalo4