Mine had 85,000 when I took it off for the first time.. been off three times since and at 104,000 miles, no leakage.

 

I took mine to the local hyundai dealer they did it for $70.00 cdn took them 1 1/2 hrs....saved me the headach and they reused the valve cover gasket its rubber so dont wory about it.....just lube it up real nice befor you put it back in