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White smoke is usually coolant burning, but you say no loss of coolant, so must be oil burning. PCV is possible fault, especially since you say smoke is intermittent. Part itself should be cheap, less than $20. One your car I believe it is located in a pipe running from intake to valve cover.
Well MAX to MIN on the dipstick is a quart of oil in difference. You need to have the oil changed every 3,000 miles (5,000 miles for a synthetic). I don't think that a 2006 Nissan should burn a quart of oil every 5,000 miles. That seems a bit absurd. For much older vehicles this might be true but for a 2006, much more efficient vehicle, it should not burn a quart every 5.000 miles.
If you have no leaks, it will be an internal issue that can only be expensive-valve seals (smokes when cold or at start up) or rings (smokes on acceleration, eventually may have issues with catalytic converter)-You are probably using 5W-30 weight oil, consider going to 10W-40 or throw in an occasional bottle of 'stop smoke' additive-while not great, 800 miles per quart is not a disaster (yet) and as long as you change your oil at set intervals (3000 miles or less), don't overheat it, and don't beat on it when cold, it should last many, many more miles.
valve seals will not cause this kind of oil consumption, a scocred cylinder wall or broken piston ring will, not sure on the head gasket, does it have a combustion gases present in the radiator surge tank or bubbles while running? if not the head gasket is probaly ok.
Every manufacturer has a guideline. But a quart every 1,000 miles seems higher then necessary. Try the easy steps first.
1. Check the PCV valve if clogged will caused pressure in crankcase and oil burning.
2. Remove spark plugs and perform visual inspection. IF electrode is covered in gook(technical terms, sorry), then oil is leaking into that cylinder. Most likely cause would be faulty valve stem seals.
3. Worse case scenario, engine oil rings are leaking. If all else is good. Perform compression test of each cylinder recording measurement, then add two small squirt of engine oil into each cylinder as you perform a second round, complete both dry then wet compression test on each cylinder before proceeding. IF any cylinder shows a more significant increase in compression then it would indicate that cylinder's oil rings are faulty. This is a major repair. Keep me posted
Oil consumption can be when the piston rings worn out, also valve gaides worn out.
means engine oil passes through the combustion chamber, you cant see smoke sometimes.but when condition of the piston ring is wost you can see smoke behind the exhaust.