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Old 09-26-2013, 08:29 PM   #1
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G35 oil problem

Does anyone else own a g35 that burns through oil at a stupid amount?
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Old 09-26-2013, 08:44 PM   #2
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Yeah man, I check my oil every week and always have to top up.
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Old 09-26-2013, 09:07 PM   #3
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knock on wood I have been checking and it's been a-ok so far. on Mobil1 no less.
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Old 09-27-2013, 05:23 AM   #4
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Im assuming you have a 6mt. Your engines done! Just check your oil every time you fill up.
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Old 09-27-2013, 08:27 AM   #5
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if its a VQ35de, there is a guy on our sentra board that has a swapped VQ, and he found alot of oil came from the VC leaking. might want to start there, alot of guys also switch 1 step up heavier oil to keep the oil where i needs to be
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Old 09-27-2013, 01:13 PM   #6
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Im running a vq35de its 6mt and im topping off my oil almost every week.
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Old 09-27-2013, 05:46 PM   #7
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if its a VQ35de, there is a guy on our sentra board that has a swapped VQ, and he found alot of oil came from the VC leaking. might want to start there, alot of guys also switch 1 step up heavier oil to keep the oil where i needs to be
Yes valve covers leak, but there would be a puddle of oil under the car every time he parks it if it was leaking that bad. Bottom line is, your block is burning the oil. Using thicker grade oil will only buy you some time.

What year is your G?
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Old 09-27-2013, 09:06 PM   #8
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Yes valve covers leak, but there would be a puddle of oil under the car every time he parks it if it was leaking that bad. Bottom line is, your block is burning the oil. Using thicker grade oil will only buy you some time.

What year is your G?
2004 sedan
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Old 09-28-2013, 05:58 AM   #9
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My pathfinder (same engine VQ35DE) needs topping up every week. I switched to 10-30 and it seems to help a bit. No oil leaks just seems to be burning oil.

there's some good info on this thread http://www.revscene.net/forums/64078...stion-g35.html
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Old 09-28-2013, 04:35 PM   #10
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Yes valve covers leak, but there would be a puddle of oil under the car every time he parks it if it was leaking that bad. Bottom line is, your block is burning the oil. Using thicker grade oil will only buy you some time.

What year is your G?
the VC tended to leak from just above the header, so it all burned off.
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Old 09-29-2013, 06:37 PM   #11
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the VC tended to leak from just above the header, so it ALL burned off.
All??? Change the vc gaskets op (IF its even leaking) and I guarantee you it will still burn oil.
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Old 09-29-2013, 09:40 PM   #12
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The VQ engine tends to burn oil, but it burns the most on the "Rev-UP" motors. I got a new short block from Infiniti while it was still under warranty. And after that it is still burning oil, its even burning more than before.

Just gotta check oil every 1500-2000km.
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Old 12-16-2013, 01:16 AM   #13
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This guy says a catch can might do the trick. Anyone actually did it and know if it helped?
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Old 12-17-2013, 11:37 PM   #14
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Oil consumption g35/350z fix - YouTube

This guy says a catch can might do the trick. Anyone actually did it and know if it helped?
Might be a bit tougher than that to determine.
Depends which catch can you use because most of the ones out their in the $100 area don't actually do their job well, if at all. .

I believe theirs a prototype on its way on my350z that it supposed to be around $200 and be extremely efficient.
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Old 12-18-2013, 07:36 AM   #15
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From my research on oil catch cans I came across this company.

Saikou Michi Co. 2013

Its one of the best out there for how well it catches oil and a great price.

They will customize it in any way for you for a very good price.
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Old 06-03-2015, 09:04 PM   #16
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isn't there a Factory recall on the motors ? for 03-05 if its burning oil.
My buddy has a 03 and he had his engine replaced because it was burning oil but Nissan paid the bill.
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Old 12-21-2015, 07:38 PM   #17
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from what i've researched, this issue can often times be attributed to the close location of the pre-cats. apparently on start up the valve overlap allows tiny bits of the substrate to enter the cylinders through the exhaust. this causes severe wear to the rings and excessive cylinder taper. not just a problem with the 3.5, but also the 2.5 i4. makes transferring a used engine quite the gamble, since a lot of them out there have this problem.
i had this issue with my murano. luckily i found a very low k engine to swap in. deleted the cats for insurance. they had failed prior to this. which can also be a good indicator that this may be the cause of your oil consumption.
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Old 12-22-2015, 06:11 AM   #18
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Quote:
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from what i've researched, this issue can often times be attributed to the close location of the pre-cats. apparently on start up the valve overlap allows tiny bits of the substrate to enter the cylinders through the exhaust. this causes severe wear to the rings and excessive cylinder taper. not just a problem with the 3.5, but also the 2.5 i4. makes transferring a used engine quite the gamble, since a lot of them out there have this problem.
i had this issue with my murano. luckily i found a very low k engine to swap in. deleted the cats for insurance. they had failed prior to this. which can also be a good indicator that this may be the cause of your oil consumption.
On the QR25, there is no EGR, so what they did is timed the exhaust valves to open slightly during the intake cycle which sucks back some of the exhaust gases to reduce emissions.
Like you said, the pre-cat is too close to the motor and this intake cycle sucks back in some of the cat material which damages the cylinder walls and causes the motor to burn oil.

My motor failed but I was lucky enough to have it covered under warranty. Once I got the new motor, I drove the car home and pulled off the stock exhaust manifold and installed one with a gutted pre-cat.
When I removed the stock manifold, you could clearly see all the fine powder from the cat that was ready to be sucked back into the motor.
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Old 12-30-2015, 07:08 PM   #19
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yea must be similar to the vq35revup. they introduced variable cam timing to the exhaust side. the revup were even more notorious than the previous vq. probably the reason why. although, the vq35de didn't have variable exhaust cam timing or egr. probably retarded gnition timing and/or advanced intake cam
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