I've got an oil leak on my Xterra and it's causing a powerful smell of burned oil in the cabin. I'm also seeing smoke come out from the hood when I park.
Nissan Xterra - How do I fix an oil leak in my 2004 Nissan Xterra
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I just fixed the same issue on mine. This may be a simple fix if the root cause is the same. For me, it was a bad valve cover gasket on the passenger side. Getting to the valve cover is pretty easy. First, you'll need to detach the electrical components from the valve cover. There are a few zip ties that you can snip. After that, you need to wiggle each connector pair off the metal tab on the valve cover that it snaps onto. Remove the hose at the front and rear of the valve cover. Finally, using a phillips head, remove the 9 bolts around the cover. Be careful not to drop these down into the engine bay.
Once the electrical components, hoses and bolts are office, you'll need to wiggle the valve cover out from under the remaining hoses that cross over it.
Turn the valve cover over and you'll see the old gasket around the edge. Mine had cracked in two places and was very brittle. Pull the old gasket out. There are a few metal tabs that hold the gasket in place. Gently bend those back to get the gasket out.
I used a Felpro gasket from Advance Auto that cost $36 for a pair.
Put the new gasket in place and gently bend the tabs to hold it in place.
Replace the bolts, hoses and electrical components. I used new zip ties to reattach the wires where they were previously connected.
I'll try to add some pictures later.