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Old 08-27-2008, 09:58 AM   #1
110100100
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Default Gear Oil

I was looking at buying some gear oil for a change in the next few months.

I was wondering if anyone could tell me if I used 75W80 for gear oil instead of the stock 75W90 if there would be an issue?
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Old 08-27-2008, 04:45 PM   #2
dcs191919
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Default Re: Gear Oil

Dont know but I hear great things about redline mt-90...
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Old 08-27-2008, 05:16 PM   #3
crypt0wind
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Default Re: Gear Oil

Stick with 75-90w, the LSD seems sensitive to gear oil. Not sure if 75-80w would be good or bad?

I replace mine gear oil with a quality synthetic 75-90w and had a "wah wah wah" noise when low speed turning from the LSD. Had the dealer replaced with stock 75-90w and fiction modifier. The noise went away.

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Old 08-27-2008, 07:58 PM   #4
110100100
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Default Re: Gear Oil

Yeah I think I might make sure to stay with the 90.
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Old 09-02-2008, 12:30 AM   #5
labikesrcool
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Default Re: Gear Oil

[quote author=crypt0wind link=topic=121737.msg2571522#msg2571522 date=1219871805]
Stick with 75-90w, the LSD seems sensitive to gear oil. Not sure if 75-80w would be good or bad?

I replace mine gear oil with a quality synthetic 75-90w and had a "wah wah wah" noise when low speed turning from the LSD. Had the dealer replaced with stock 75-90w and fiction modifier. The noise went away.


[/quote]
What was the synthetic oil that you used?
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Old 09-02-2008, 12:28 PM   #6
bacarl
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Default Re: Gear Oil

Is that "wah wah wah" noise what's typically described as LSD chatter? I have MT90 installed and I have the same noise; it doesn't sound like any kind of "chatter" to me.

The noise is worst when cold and doesn't necessarily go away when it warms up. How much of an issue is it thought to be?
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Old 09-03-2008, 05:39 PM   #7
crypt0wind
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Default Re: Gear Oil


What was the synthetic oil that you used?
[/quote]

Valvoline full synthetic 75-90 @ oil change place.

[quote author=bacarl link=topic=121737.msg2582785#msg2582785 date=1220372882]
Is that "wah wah wah" noise what's typically described as LSD chatter? I have MT90 installed and I have the same noise; it doesn't sound like any kind of "chatter" to me.

The noise is worst when cold and doesn't necessarily go away when it warms up. How much of an issue is it thought to be?
[/quote]

Not sure if the noise is a issue, but once I started to hear the "wah wah wah" I thought something was wrong. It sounded like a bad wheeling bearing or something on the front passenger side. So I had the dealer take a look for a bad bearing and the tech told me that the LSD was slipping with the synthetic gear oil. All I knew was I didn't hear it before the gear oil change.

Once Mazda replaced the gear oil with stock gear oil and added fiction modifier the noise was gone.

Call it "chatter" or "wah wah" it's the likely the LSD slipping. The synthetic might be too good and slick.

Is the synthetic gear oil doing damage? Likely no, but I'm not a tech.

I just didn't like the noise and glad it's gone.
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Old 09-04-2008, 07:29 PM   #8
ericm979
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Default Re: Gear Oil

I put Amsoil (speed shop was out of Redline) 75-90 synthetic in last weekend and I have been getting the same noise. It does sound a lot like a wheel bearing going bad, except it's only at low speeds. It's annoying. Is it damaging anything?
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Old 09-04-2008, 09:04 PM   #9
crypt0wind
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Default Re: Gear Oil

Hate to say it, but I think the stock gear oil is better than a synthetic gear oil replacement. At least the factory gear oil doesn't make noise when turning.

I wonder if the MS 3 came with a fiction modifier from the factory?

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Old 09-08-2008, 02:17 PM   #10
ericm979
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Default Re: Gear Oil

I wonder if the oils we used (Valvoline and Amsoil) don't contain the friction modifier that Redline has.

Unfortunately the Amsoil site does not say if their oil has it.
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