That is a good question. Oil capacity of the engine is 5 3/4 qts. That means that you are burning off or leaking 17% of the oil every 1000 miles. A quick Excel table will show you the effect.

Assumptions for Case 1
1) REV-UP motor
2) Top off 1 qt of oil every 1000 miles
3) No oil or filter changes

Assumptions for Case 2
1) REV-UP motor
2) Oil and filter change every 3000 miles



Notice that after 6000 miles, almost 1/3 of your oil would be 6000 miles old! Also notice that after the 2nd oil change of a brand new engine, 11% of the oil is from the 1st oil change and 1.7% of the oil is still the original oil.

This should be interesting for those that are doing UOA. I would think that because of this you would need to wait until two oil changes before being able to make strong conclusions about changing oil types. After one oil change, 11% of your old oil is left in the engine. After two oil changes, only 1.7% of the oil would be the original type.

Beyond old age, the other question is filter life. After a while, your filter will become dirty, and if you use a bypass filter, you will begin to stop filtering your oil very well.

If you were using a high quality synthetic and a good filter, I would be tempted to change the oil every 4-5 thousand miles but no more.


Bigger question is why are your driving the car that way? I would have thought that you would have gotten Nissan to give you a new engine by now.

 

That's for a 'dry' engine (overhaul or fresh remanufactured). Normal capacity w/filter = 5qts.

My UOA's are not skewed when I change oils or add same in between OCI's, according to my Tribologist. Formula changes and oil performance is quite apparent when I change oil types/brands, but valid assumption and thought the same years ago. -edit- However, -edit- nice number crunching btw...

Agree. 5k mi is as far as I'd push Synth in any VQ.

Agree and should be in OC testing with Dealer imho.

Front page of TSB (found on post #1 here) discloses which ones have this issue much more-so than others, hence no TSB on those 'others'.

No question is stupid, but why not start OC testing with your dealer especially with that OC rate and being an 06 (power train warranty still valid unless you're over on miles)

 

[QUOTE=06CPV35;7787345]

Front page of TSB (found on post #1 here) discloses which ones have this issue much more-so than others, hence no TSB on those 'others'.

QUOTE]

Thank you very much for responding.....

Allen

 

Long thread. Lots to digest. No problem.

 

Thanks for the quick response guys well I actually have a 03 Z and blew a rod in my block so I got a good deal in a 06 rev-up. I like the rev-up very much I can live with adding a qt every couple of miles. Thanks again big help

 

I had an oil change 2 months ago with synthetic....and as of 2 - 3 days ago my car starting making a LOUD pinging noise when I was in the 2k-3k rpm range. I take it to the dealership today and find out that I only have 1.5 qt's of oil in my car! I have only driven my car 2k or so in 2months. I have to go back in 1000miles

I had plans to put on my turbo kit, thanks god I hadn't done it yet.

 

Please tell me your joking....

 

Hey I just thought I'd poke my head in here for nostalgia sake, and I can't believe this is STILL an active thread!!

https://my350z.com/forum/6666033-post3700.html

I was one of the many who went through the buy-back process.

I've been driving an '06 Acura TSX 6MT, and I have to say that I really, really miss my Z.....

But on the bright side, this has been the most trouble-free car I've ever driven.

Good luck to you guys still with issues.

Right now, priorities are B-School, First Home, etc. but I hope to get another performance car down the road!

 

My Z failed the O/C test so I drop the Z off Monday for the new motor

 

so many posts..

vq35de rev-ups commonly have oil consumption issues?

what about earlier vq35de's? and later vq35hr's?

 

Yes, Maxima 6 speeds have this issue as well. I believe the altima 6 speed's have it as well. If your automatic I would check it as well. haven't really heard of any issue's with to many auto drivers.

 

HR's I'm assuming are in the clear with this, but I don't troll HR sections to know for sure. I'm a revup DE and all I research on.

Wow Maxi and Altima 6mt's. I believe non-revups are in those, but don't quote me (depends on their hp and redline whether a revup or not).

 

Yes you are correct, I forgot the Rev-up's and HR's are still VQ35's No I haven't heard about any burning oil issues with the VQ37's I am sure if there were someone would bring it up.

But as far as I know, is the DE and Rev-up guys have this issue, it seems to be more common with 6 speeds though. There's at least 10 threads about burning oil on the 5.5 gen and 6th gen 6 speed maxima's on maxima.org

 

Update:

Failed the OC Test

New Long Block from Japan has arrived and is being installed

The dealership is also installing headers, pulleys, lightweight flywheel, new clutch and all silicone coolant hoses. WHEEE!

 

was it a revup block? I hear they are using the DE block instead for replacement. is that true?

 

Yup, Mine failed also, I should have it back tomorrow. I also got the Nismo clutch and headers I bought installed for free because it was all apart anyway!!! I cant wait till tomorrow

 

Late reply but...

5.75 qts is the oil capacity of the engine. You are correct that when we do an oil change (with filter) that the amount of oil that we have to add is 5 qts. However, the amount of oil in the engine is still 5.75 qts. It is just that the 3/4 qts can't be drained out of the engine. So if you add 5 qts of a different oil to the engine, you are adding it to 3/4 qts of the old oil mix. So, when we do an oil change, we are only changing 87% of the oil.

Now, maybe that 13% of remaining oil doesn't matter, but it would seem to me that a UOA could be off as much as 13% off. However, if a new oil was used for two oil changes, then the amount of the old type of oil would be only 1.7%, which is pretty insignificant.

Of course, I could be wrong....

 

Revup and non revup 'short blocks' are DE series VQ's. Always has been.

 

Plus 1.

 

I have an 06 and my car burns alot of oil due to this if I take it to the dealer and have them run a check on it are they obligated to replace it if it fails the oil consumption test?