If you do a search for "M45 oil" (search button is in the upper right corner of this screen,) you will see some posts that talk about this issue on the 2003/2004 M45 (and some years of the Q45) with the same VK45DE engine. In the meantime, I will paraphrase some of this for you here.
searchman wrote:I have a M45 that uses 1 quart of oil between 300 and 600 miles. 65,000 mile curent. Has used this amount of oil from new 2003 model. Consumption varies according to the type of driving conditions. The dealer states this is normal. Yeh! Right!
1. This is a known problem on some percentage of the M45 and Q45 cars that were sold. The engine is just a bit "looser" than the previous years to achieve the higher power that this engine has.
However, a quart every 300 to 600 miles is way excessive! And simply not normal. What would be normal is a quart every 3750 miles (i.e., between my oil changes). That is what my M45 achieves easily. Some people report a quart used every 1500 to 2500 miles - this is the minimum acceptable amount imho.
2. Infiniti will replace your engine if pushed - many of these engines have been swapped out (the rumoured threshold was a quart used below every 1000 miles, which definitely applies in your case.)
Be quietly pushy and talk to Infiniti Corporate if you have to, but simply do not take "No" for an answer - tell them that you know that they have done this for other owners. It is a bit more tricky in your case since you waited for 65,000 miles, but you never know, Infiniti may help out. Yelling will not help, but not allowing a No answer may!
Do this before your warranty expires, by the way!
3. Then, when you get your new engine (we will keep our fingers crossed,) break it in properly. Here is my recommendation:
a. Don't baby the car. Drive the engine relatively hard the first few hundred to five hundred miles, with high revving and acceleration (not crazily, but just don't baby it!) You must seat the rings well ... this is the source of the oil blow-by and high consumption.
b. Use a good dino oil (like Chevron Supreme 5W-30 or 10W-30 or 10W-40, depending on where you live) for the first 10,000 miles ... at least. Then switch to a steady diet of Mobil 1 0W-40 Synthetic if you can affort it; if not, then stick with the Chevron Supreme.
If you want other engine oil recommendations, do a search for posts by "palmerwmd" on the topic of oil. Fred is our resident chemist and knows a lot about this stuff!
c. Change oil and filter more often than usual the first few times. My personal approach is designed to deal with the moving parts "deburring" that occurs inside the engine upon first use. This is an easy, relative low-cost way to increase the longevity of the engine.
Buy the filters from Infiniti and the oil from local auto parts stores and do the oil change yourself or go to a place that will change it out for you for a nominal cost. That is what I do (no lift and time to do it myself, but I should!)
d. My oil and filter change schedule is: 300-600 miles (wanted to but did not do this one), 1500 miles, 3750 miles and then every 3750 miles. This is a mite aggressive, but I can tell you that I am achieving among the lowest (if not the lowest) oil consumption rates of all the M45 and current-gen Q45 owners here!
searchman wrote:The last time I took it in the service writer said I was reading the dipstick incorrectly. There are two holes in the dipstick by the graduation markings. The upper hole shows full the lower hole shows add. The dealer states the distance between the holes in 1 quart. I know from adding oil this is incorrect. I am looking for documentation to show the factory specs on the dipstick.
I think the dealer is right is correct in this "quart between holes", but I am not certain. I'll look in the service manual and get you the answer, if it is in there, later today ...
FWIW, the "upper hole full" and "lower hole add" is not the way I would have described it. Those are the extremes - my wording would be "don't add oil past the upper hole" and "don't let the oil drop below the lower hole" (being in the middle is fine!) The point is having too much oil can be bad for the engine too!
As an aside (you probably already know this, so pardon the sermon here,) the oil must be checked consistently for the readings to be comparable. I.e., always in the same - ideally level - position and always when the oil is cold. The "wait 10 minutes to cool down" rule of thumb is not a good one - I check my oil (and tire pressure) in the morning before I start the engine up. Not every day, of course but regularly (every two to three weeks.)
Good luck and let us know how it goes with the dealer and Infiniti Corporate! Come by often - we need lots of M45 owners to participate here.