R34 With A Bizarre Smell Of Gear Oil

[Carbon 34]

My R34 GTT with just 57,000 k on it has a weird gear oil smell that since i got it last january is driving me nuts, I get a gear oil smell coming inside the car at highway speeds with or without the windows open and sunroof open, or with or without a/c on ? seems to come up from gear stick area but I have taken the whole lot apart to see if the gasket has failed, and had Sinergy look at it 3 times under warranty, we dont see any leaks at all on any fluids? or burning of a oil on the cat or pipes under the car ?, no smoke , nothing at all just a stink of gear oil faintly in cabin

had the oils changed to synthetic about 10k ago, no leaks or anything else found? its the 5psd - RB25 engine

and its been doing it now for close to 15,000k but nothing leaking at all?Not even seeping on any seals?

my thought is it might be inside the bellhousing , the front input shaft seal leaking into the housing just a tiny bit , not enough to get on the clutch? the tranny-drivetrain whines a lot more then I would expect in a low K car thats not abused or hamfisted shifting? nothing is loose and sinergy hasnt got a clue either ? I think the tranny is close to dying , when I corner hard the gear noise sounds worse in the tranny area ?, like a main bearing is worn and the gears are sliding over due to the G force and torque , oil moving to one side of tranny, the gears dont grind since the oil was changed over and no metal parts were found in the oil or drain plug magnet?

another thought was a vent tube to the tranny is coming thru the vent in the firewall area , but havent gone on the hunt for the vent yet ? Sinergy thought it might be that?

the clutch still has about 6months before it goes away so not pulling it out to look yet ?

anyone else have any ideas or had it happen to them ?

[BeEnAr]

I have gear oil smell in my 32. I think it is the boot on top of the gearbox that is either gone or ripped. The one in the car where the stick is is fine, will rip it off one day to see the lower boot. If it's gone it's a $25 part from Nissan from memory

[Carbon 34]

yeah tried that, took it all apart nothing ripped and the seal wasnt torn on the gearbox top ? clean to he point of surface rust on the bolt heads, not a drop of oil at all.

thanks for the input, any other ideas?

forgot the R34 has a filter on the A/C might pull it out tomorrow for a peek at it ? prob disgusting original filth from osaka japan ? and a part nobody stocks..lol

[CRoNic...]

Someone once told me gear oil smelt the same as clutch fluid! Master or slave cylinders not leaking or anything?

Yeah A/C's can let off weird smells sometimes, too.

[RubyRS4]

You sure its not the smell of your passengers shitting themselves?

Seriously tho, if there are no signs of any leaks anywhere in your engine bay, then its prob the air con letting off stink

[GTROB]

Check your gear box oil again and if it down then yes you are losing oil some where. You don't need alot of gear oil on hot metal to make alot of smell. Horrible smell isn't it.

[IZZMO 33]

my 25 box is doin the same thing, ive taken my box out twice now, to do clutch and replace forks and pivot ball etc... but i have no leaks and my breather hose is fine, and breather not blocked.... ive heard about this happening on a few skylines now.... for the moment it looks like something thats not fixable

[Carbon 34]

checked the oil again , all good, and not a drop of anything under the car sure beats my old Oil leaking bitch of a VT commy, surprised green peace didnt defect that car for the oil spillages ......lol

tail pipe is still shiny stainless steel no oil burning marks on it

no power steering oil, A/C compressor oil or clutch,brake fluids either, it is distinct smell of gear oil you can't forget that lovely smell..lol and it doesnt smell burning , just faint fresh smell , and no its not on my floor mats either..lol

actually the car underside is spotless still, I power washed it to see if the oil was under it a few months ago.

never got to the A/C filter today tomorrows project ..today went down hill with the EX wiff driving me insane. .lol

I guess one option is to extend the vent line to another location away from the cowl vents by the wipers

HMMMM ....be the passengers shitting themself...lol had one tonight beg to get out...lol guess thats what she gets for being drunk and bouncing around so much with the stiff suspension and a few roundabouts..lol, she hates the car !!!! oh well next time she can walk her drunk ass home from the pub then..lol

no patience for drunks being a bitch to me in the front seat,when I'm 100% sober..lol Merry Christmas and dont let the door hit you in the ass when get out..lol sorry for venting..lol and yes she drives my R31 normally