I think my HPOP is leaking but hard to tell without tearing into it. Heres what i got... Alot of oil on left bank exhaust manifold leaking onto front drive shaft. A small amount on right bank exhaust manifold. Small amounts near oil filter housing and alot on rear of engine around starter and bell housing. My fuel mileage is a bit lower than it should be and sometimes i get a "miss" feeling. Done fuel and oil filter changes within last couple months. Run diesel kleen through it every fill up. Does anyone else think it could be an HPOP leak?