Plenum intake gasket leaking. Was consuming a quart of oil every 500 miles. I added a liquid gasket sealer to the oil and now am only using a quart every 2000 miles. But it's only a matter of time before it will require a replacement gasket costing approximately $1200, mostly labor. Research shows this is a common problem due to an aluminum plenum contracting and expanding at a different rate than the engine block due to dissimilar metals. Bad design.
Increased oil consumption and haven't tried to fix
Oil on cylinder number eight spark plug
Saw the tail pipe smoking white transparent smoke, checked oil two quarts low, gallon of anti freeze ..SLT 4x4 4 door Durango 4.7 v8
2 1/2 quarts of oil had to added within 2 weeks. Truck developed misfire on cylinde #8. Took it to firestone and sparkplug was fouled by oil leaking into cylinder. Check engine light came on. I'm guessing this is the intake manifold gasket