05 5.7 hemi burning 1 qt every 700 miles

If you have not been too good about doing oil changes clogged lifters is very possible. There are many products to flush your oil, but what I prefer is to change your oil and filter , put in 1 quart of marvel mystery oil in place of one qt of oil, run for about 100 miles then change oil and filter again

is the royal purple oil the same viscosity as recommended,also sounds like a oil pump goin bad does your oil light come on

it is within factory specs to burn more than a quart of oil within 2500 miles it is also common with oil changes are done at small and quick oil change places that the oil is not filled to the max level making it look like it burns more than it does and not using synthetic oil as required asl makes a difference

check the cv axles at the front differential. inner joints get loose on the splines and cause a knocking noise.

If the valve lifters are quiet you most likely have oil pressure even with gauge showing "0".Sounds like the oil pressure switch going bad.I would try that first.

1 quart every 2000 miles. Not all cars are created equal. The same model may burn alot less or even more.

I don't have a owners maual either but I beleive its 10 liters.Use 15w40 ams oil with ams oil filter.7500-10000 miles for filter changes and 20000 miles between oil changes

Slide a large piece of cardboard under the truck after driving for ten minutes note in which area directly above the spot on the cardboard the oil is coming from then get under the vehicle with a drop light to look for the origin of the leak, if no leak is detected then it may be the engine is burning oil this could either be valve stem seals or broke or worn oil rings.

knocking sound all the time?

when i blew the motor in my car it was pumping oil knocked real bad..

its on its last leg

Sometimes a valve lifter will stick and cause a ticking it is possible that a valve lifter has lost its prime or it might be that the oil is too thin. Wthout more info my bet would be a lifter