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R33 S2 Oily Smell Incabin

dekodE_

By dekodE_,
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dekodE_ Apprentice

dekodE_

Posted
Posted

Hi guys,

First up I own a 98 R33 S2 GTS25T Skyline with the following mods:

HKS Cat back exhaust

De-cated

Pod Filter

GFB Hybrid BOV

I've noticed a oily smell incabin... partically when i'm slowing down or have just been giving it a bit of stick. I changed the oil about 4,000km's ago with Shell Helix 5w40. This problem has only seemed to arise since I've de-cated the exhaust?

Any ideas what it could be?

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**RB2530** Proficient

**RB2530**

Posted
Posted

Check that you haven't caused any exhaust leaks during your decating process (did you replace gaskets) Do this by letting the system cool down completely and rub 50/50 dishwashing liquid and water over the flanges. Then start the car and look for bubbles...

dekodE_ Apprentice

dekodE_

Posted
  • Author
Posted (edited)

Yeah, I'm not sure about the gaskets - An exhaust guy fabbed it up and installed it.

I guess I'll jack my car up tonight and unbolt it and have a look.

Cheers mate, also I was looking at some Fuchs 5w40 oil, whats that like for a RB25DET?

Edited by dekodE_
MrStabby Grand Master

MrStabby

Posted
Posted

FWIW there are heavy penalties for removing emissions equipment (ie decat) for a car that's used on the road. A high flow (magic cat/metal cat/catco) style cat shouldnt restrict power at all on your setup, and will reduce the smell and the amount of black crap that will end up on your rear bar.

Munkyb0y Grand Master

Munkyb0y

Posted
Posted (edited)

you may also have a leaking rocker cover gasket. usually passenger side. the oil gets onto the block, and when boosting around, the higher block temps burn the oil and you can smell it quite a bit.

what the f is FWIW?

lol ...for what its worth

Edited by Munkyb0y
dekodE_ Apprentice

dekodE_

Posted
  • Author
Posted (edited)
Fuchs is fuching good stuff! :) Pricey but worth it.

Sweet, I think its about $79 for 5L which isn't too bad. I might grab some tommorrow.

Had a look in the engine bay for any leaks, and tried to "sniff for oil" couldn't find anything.

Then I took the car out for a spin, It was only really noticeable once I had come to a stop (So i'm still thinking it's an exhaust leak as first suggested, guess I'll jack the car up tommorrow and check it out.

My current oil level hasn't changed, and my car doesn't smoke at all, even on boost... :laugh:

Edited by dekodE_
vinnie32GTS4 Mentor

vinnie32GTS4

Posted
Posted
The rubber seal around base of your gear shifter might be split. That will give off an oily smell in the cabin.

exactly what i was goin to say..my car had a short shifter in it when i bought it but i didnt like it so i bought a gtr shifter to replace it..when i went to take out the short shifter i found the previous owner had put a tea towel around it to stop oil spiting out which stoped the smell getting to the cabin and the short shifter had no seal..so i had to buy a seal from nissan when i put the gtr shifter in and i removed the tea towel..i had an oily smell in my cabin for round 2 weeks but its gone now :D

GeeTR Grand Master

GeeTR

Posted
Posted (edited)

Interesting idea's being thrown about when OP said...

...This problem has only seemed to arise since I've de-cated the exhaust?...

Every cat'less car i know has a particular smell to it. Hard to describe. When idling, and a breeze blows the fumes into the cabin, smells kinda oily i guess; sure its not just that?

If your sure it only started when you ripped the catback off, smashed the china out of the cat and shlaped it back on... then start there first.

LoL @ Luciano_GTST.... Google will tell you all abbreviations ;)

Edited by GeeTR

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