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Gear Oil Smell in Interior?

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Old 02-04-2007, 11:09 PM
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Originally Posted by Charles R. Hill
Would be nice to get our hands on Swoope's extra tranny and pull it apart......I have some other ideas about how to make it stronger and would love a peek inside.

move to lakeland, it will set you free. and hogcar wins...

you can see the scale and the pen i pointing to what would be my guess is the vent... i can lift it up and spin it...

i wonder if you fill through the shifter it drifts over, or an over fill spits oil....


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Old 02-04-2007, 11:17 PM
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Originally Posted by swoope
i wonder if you fill through the shifter it drifts over, or an over fill spits oil....
Well, that's part of the mystery - I've got no leakage at all. The entire tranny is completely dry on the outside. Spotless.
So is the turret.
Old 02-04-2007, 11:38 PM
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how many people smelling this have an uninsulated aftermarket cat/mid pipe?
Old 02-04-2007, 11:56 PM
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Originally Posted by TeamRX8
how many people smelling this have an uninsulated aftermarket cat/mid pipe?
i think i qualify as not insulated aftermarket cat... and no problem... trans oil was changed at 30k miles with rp... as was the diff...

was done by the dealer while they were replacing my mop...

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Old 02-05-2007, 12:44 AM
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What happened to the MOP?
I think mine is sticking open after hard runs.
Old 02-05-2007, 01:05 AM
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Originally Posted by MazdaManiac
What happened to the MOP?
I think mine is sticking open after hard runs.
had a cel, at 18 k miles... they replaced the o2 sensor. then at 30 k miles. with lots of imput the mop was replaced... car never ran bad. but bad stuff happened after...

pm me for the rest of the story...

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Old 02-05-2007, 01:53 AM
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I went to Redline 75W140NS gear oil after the second trans failure, partly because I know my trans is getting much hotter now due to the radiated heat from my exhaust which I know for a fact glows bright cherry red under various throttle conditions (melted the rear O2 wiring connector solid ) and comes a bit closer to the trans due to the straighter run. I never got the gear oil smell until I made that oil change, and I didn't fill it through the shifter because if you ever spill gear oil in the interior you'll never get rid of that smell.
Old 02-05-2007, 02:08 AM
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Originally Posted by TeamRX8
I went to Redline 75W140NS gear oil after the second trans failure, partly because I know my trans is getting much hotter now due to the radiated heat from my exhaust which I know for a fact glows bright cherry red under various throttle conditions (melted the rear O2 wiring connector solid ) and comes a bit closer to the trans due to the straighter run. I never got the gear oil smell until I made that oil change, and I didn't fill it through the shifter because if you ever spill gear oil in the interior you'll never get rid of that smell.
Must be running some monster EGTs. My midpipe doesn't reach those kinds of temps.

The technique for the gear oil requires a few feet of nitrile tubing and a funnel.
Chance of getting gear oil inside the car is nil.
I have a magic potion for oil spills, just in case.
Old 02-05-2007, 02:15 AM
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ok, I thought you were just pouring it in the hole
Old 02-05-2007, 11:16 AM
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I have a full factory exhaust system and have only filled the tranny from underneath the car. I might have gone maybe a tenth of a quart over on this latest fill, but that's the only reason I can thing of.
Old 02-08-2007, 07:24 PM
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The dealer (of course) says they can't smell it. I'm going to try sealing the rubber boot this weekend and seeing if that helps.
Old 02-08-2007, 08:46 PM
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Originally Posted by TeamRX8
how many people smelling this have an uninsulated aftermarket cat/mid pipe?
I got it at the track day I did with stock cat.... Never had a problem on the street or autocrossing.
Old 02-12-2007, 10:17 PM
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I got the oil smell too after my second trans oil change. No leaks at all, not even any residue. It's absolutely clean and yet, the light smell.
Am I a car geek if I like it?
Old 02-12-2007, 10:50 PM
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I got it after I added Pre mix.

Had it for 3 tank fulls, then it went away.

Are you sure its not premix?
Old 02-12-2007, 11:18 PM
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gear oil and exhaust oil are two entirely different smells
Old 02-13-2007, 12:57 AM
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Even though I was entirely sure it was gear oil, I still stuck some up my nose to be sure (for comparison).

Originally Posted by musclecarconvrt
Am I a car geek if I like it?
Yes. Yes, you are.
Actually, if I know that it isn't something immanently failing, I don't mind it either.
The wife has a different opinion...

Last edited by MazdaManiac; 02-13-2007 at 01:06 AM.
Old 02-16-2007, 02:37 PM
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Originally Posted by Razz1
I got it after I added Pre mix.

Had it for 3 tank fulls, then it went away.

Are you sure its not premix?
It's not premix. I don't premix (yet - waiting to hear what olddragger finds out from the lab) and I have the smell. Like a lot of folks, the smell started after my first tranny fluid change last June.

Hopefully someone figures out how to get rid of it 'cause I can't stand the smell.
Old 02-16-2007, 03:44 PM
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I just noticed the smell after my RP tranny change, but it was probably the most noticable after about 4-5 days of NOT driving the car b/c of winter weather...??? I went to get something out of the car after it had been sitting for 5 days and the smell was very noticable??
Old 03-16-2007, 12:17 PM
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I'm reviving this old thread. I just changed the transmission fluid to RP75W90 and now my cabin smells like a giant natural gas leak!! I thought maybe it'll go away after a week, but it's actually getting stronger. Kind of iffy if you think about it cause we've been breathing in the odorless OEM transmission fluid all this time unknowningly.

Why can't aftermarket gear oil be odorless like the OEM fill?!
Old 03-16-2007, 01:04 PM
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OEM oil stinks, too.

I don't know why this is happening and I am stumped.

I checked every seal on the tranny (front, rear, turret and all of the sensors) and I can't find oil anywhere.
Does any manufacturer make a dye that would be benign to the transmission internals that I can add to the oil for a couple of weeks?
Old 03-16-2007, 01:29 PM
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Yes, on the dye. We use it in the OEM and, with an ultraviolet/black light we see where the leaks are. I'll look into that and see where I can direct you to buy some. Even better, if we have some laying around I'll send it to you. In the meantime, try "apexdyes.com".

Last edited by Charles R. Hill; 03-16-2007 at 01:32 PM.
Old 03-16-2007, 01:35 PM
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The only thing I can think of is my OEM fluid fill was a little low. Maybe they underfilled it on purpose.

Do people with the Miata have the same problem?
Old 03-16-2007, 02:14 PM
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Same problem here. Been almost 3 weeks now. The smell seems to be dying down though. Only a very faint smell now. I'll give it more time before I tear down the center console.

FS
Old 03-16-2007, 03:08 PM
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if you want the rid the smell forever guys buy new cabin air filters.
Old 03-16-2007, 04:52 PM
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Originally Posted by VarneyMazda
if you want the rid the smell forever guys buy new cabin air filters.
You've obviously never worked with tranny fluid


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