Vehicle is a 2007 Nissan Xterra 4.0 V6.
Short history. 238,000 miles nary an issue in ten years. Until this year simple routine maintenance. The fuel temperature sender went bad which caused the check engine light to go on so I could not get the vehicle inspected. As I was waiting for the sender unit to arrive a multi cylinder miss fire in bank one developed. I assumed one of the Cats went bad so I replaced all four and all four O2 sensors. I also replaced the fuel pump/ sender unit.
Recently the Xterra started consuming oil, which it never did. Excessively consuming oil. like four quarts in one month or less than a few hundred miles. It also began billowing white smoke at start up. I did an oil change including filter and replaced the PCV valve. Air filter is clean. For a few days it seemed the problem was fixed. This morning I started the vehicle and again it is billowing white smoke. Checked dip stick, no oil. Temp outside is about 30 degrees. After about five minutes the smoke has mostly cleared. However, there is a wet spot on the pavement under the tail pipe. Smoke smells like petroleum not antifreeze. Also no drop in antifreeze level.
No oil stains on my driveway and engine block is dry except for where I spilled the oil trying to refill the crank case. so not a leak and running out.
