^^ If you see blue smoke from the exhaust and use oil, your engine is burning oil.

A common fix is a short block engine replacement.

I would take the car to a trusted shop and ask them the best solution for the problem.

--Spike

 

You need to have a leakdown test done on all 6 cylinders to determine if you need head work or a short block. A simple compression test may not reveal worn rings like an actual leakdown test would. If only one cylinder leaks down you may discover a problem with one of the heads, like a bad valve, vs a problem with all 6 cylinders. A bad valve may not make any noise either, but could have a bad seal allowing oil to be burned. It's rare to have one piston with worn rings, they usually wear evenly.

Before I forget, try a new pcv valve, they're known to cause oil burning on Titans....ask me how I know lol.

 

How do you know?

 

Thank you so much now im gonna try to get leak down test I changed pcv valve problem still there. anyone know a good site to purchase short block? Thanx

 

How much oil is it going through?

 

Hi it depends on how much I drive the car I always have 2 litre of oil sometimes I finish it sometimes I don't. do you know if 2007 and up 350z engine will be compatible on 2003 350z?

 

You probably need a short block swap (and it should be a 350z engine) if you intend keeping the car. --Spike

 

You need a vq35 DE block if that's the problem. I would invest some time into figuring it out first....short blocks ain't cheap!

 

Thanx for reply Im thinking of getting a used engine my car is manual transmission. Will there be a issue on swapping if I buy the engine and it came from auto transmission ?

 

Shouldn't be an issue, but the junkyard will have an interchange manual to be sure.

I would still do the leakdown tests if I were you. If you could have one head pulled and fixed you'd be way better off than going through an entire engine swap with a used engine.

 

Yes ill get a leakdown test first thank you so much guys