Nissan NV 2500 HD oil leaks.
Leaking may be due to the oil cooler gasket failed and/or poorly designed oil cooler attachment bolt.
At about 389,000 miles, I noticed small drips coming from the oil filter area. Did an oil and filter change. Still dripping.
Researched for the diagnostic and repair costs. Up to $700 +. Nope, ain't going to pay those prices.
Scoured the internet and found the potential problems. Zeroed in on oil cooler gasket failure.
Went to the dealer got the gasket for about 9 bucks, watched the repairs video from YouTube. Done the replacement in about an hour.
That was 2 days ago. So far, no more leaking. Ya!
***The oil cooler bolt is a single bolt that attached the oil cooler to the engine on one end and on the other end is for the oil filter to be screwed in.
Potential problem is when the oil filter is removed each time during the oil changes, it could loosen up the oil cooler bolt. That could cause the oil leak from the gasket on the oil cooler side.
To prevent this problem, at each filter change, check the oil cooler bolt and tighten to the spec before replacing the oil filter.