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View Poll Results: Year/Model of your G having EXCESSIVE OIL CONSUMPTION
2003 5AT 67 9.61%
2003 6MT 76 10.90%
2004 5AT 47 6.74%
2004 6MT 82 11.76%
2005 5AT 51 7.32%
2005 6MT 167 23.96%
2006 5AT 22 3.16%
2006 6MT 147 21.09%
2007 5AT 13 1.87%
2007 6MT 25 3.59%
Voters: 697. You may not vote on this poll

Poll: Oil Consumption

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Old 11-03-2014, 11:10 AM
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I have an 03 Coupe 5AT, 101k. There was seemingly no issue with oil burning until my last oil change made it quite clear. It had to have been low. So I checked after a week, still all the way at H. 2 weeks after that it's 1/3 down from H to L at about 1,200 miles. Does anyone know how much oil that is roughly?

Also, is putting oil in every few weeks a decent measure? I'm not trying to pay for a new engine for a 12 year old 100k+ miles car. $25 in between changes seems like a better option if it doesn't get worse. Not sure what else I can do, if anything.
Old 11-25-2014, 04:50 PM
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Been through a lot of pain, "blood, sweat & tears", R&D, Trial & Error with my VQ35DE motor.
To save most of you guys time, I'll share what I've done and noticed from inspecting the VQ.

#1: Piston rings - seems to be the most probable and annoying cause, since the OEM rinigs have a light expander behind the oil scraper ring. For some reason Nissan changed them to these in '05. I ended up just buying a low mileage motor and building it ground up. (CP pistons, rings, Carrillo H-beam rods, pins, ACL bearings, ARP main and head studs/bolts, Cosworth baffle, IP billet girdle, etc.. Going TT)

#2: PCV valve - as said, it's best to have a catch can or breather setup in pcv valve port to regulate and remove fumes from the engine crankcase, and to alleviate crankcase pressure which could cause oil leaks or seal damage. ()

#3: Oil pump - most build shops all recommend switching to atleast the Rev-Up oil pump to keep oil pressure up and able to handle high rpm (7k)

#4: Head gasket - not often does a headgasket fail on these motors, but Nissan's new design with the VQ35HR's head gasket, helps cool the backside of the motor evenly. A small modification (grind 11mm deeper in block for water passage) is needed. I also recommend the Pathfinder Cooling Kit. Best installed with motor out. ( )

#5: Get a tune - keeping AF/R in check even after installing a few bolt-ons will really help the motor from running rich thus burning tons of oil

#6: Spark plug seals - I didn't have to change these, but have noticed a few owners that have had oil seep into their spark plugs. A good sign is when you're changing them, you'll see oil on the back sides of the spark plug. You can buy a whole valve cover gasket kit from here:

Add longevity to your motor: If you ever decide to rebuild your motor, I recommend getting WPC Treatment - wpctreatment.com - they have the technology to harden important parts of your engine, bearings, and other moving parts while also decreasing friction with their surface treatment. A lot of good results are coming out of this treatment...check out this live test:

To all the other techies or guys/girls with more experiences to add, please do.

Last edited by drifterxG; 11-25-2014 at 07:21 PM.

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