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Old 10-01-2009, 09:08 PM   #1
STirish
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Default Running Redline 75W90 NS in a STi tranny...Thoughts?

Hey Y'all,

Playing around with tranny/diff fluid and wondered what some thought about running strict Redline 75W90NS in the STi 6-Speed tranny. The implication is that the diffs share fluid with the tranny. The idea being better lock up during wheel spin.

The car is strictly used for motorsports other than drives to/from the autocross/track and a rare weekend trip to the hardware store to remind myself why I don't daily the car.

A little info from redline:
http://www.redlineoil.com/product.aspx?pid=47&pcid=7

Rob
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Last edited by STirish; 10-02-2009 at 02:02 AM.
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Old 10-02-2009, 11:50 AM   #2
gregr01
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I've been using RLO 75W90NS exclusively since 2005 in the transmission.

Recommend it, and standard RLO 75W90 in the rear diff.
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Old 10-02-2009, 11:50 AM   #3
unclemat
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Use Subaru Extra-S. Much better than some piss thin Redline crap.
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Old 10-02-2009, 12:14 PM   #4
pete_falcone
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Amsoil 75w90. It's the S.
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Old 10-02-2009, 12:35 PM   #5
STirish
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Maybe I should have been more specific. It's not a discussion of which fluid people use, but a discussion about running a fluid without a friction modifier. The kind of thing that makes the diff audibly bind when turning tightly at slow speed. Think when the 50/50 lock is set.

Thanks,
Rob
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Old 10-02-2009, 12:37 PM   #6
STirish
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Quote:
Originally Posted by gregr01 View Post
I've been using RLO 75W90NS exclusively since 2005 in the transmission.

Recommend it, and standard RLO 75W90 in the rear diff.
Why? Can you talk about the benefits/cons you have seen vs. running a stock fluid or a fluid with a friction modifier. Any diff issues to report. What kind of mileage and use have been put on the car?

Rob

Last edited by STirish; 10-02-2009 at 12:45 PM.
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Old 10-02-2009, 01:23 PM   #7
gregr01
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Been covered in this forum more than once previously--see this thread for good info and opinions.

Before going with RLO I spoke with one of their engineers (Dave). As I posted back in '05:
I've tried Red Line ShockProof Heavy and LightWeight Gear Oil in the rear diff and they both caused chatter. Went to their standard 75W90 after contacting RLO directly--this was their specific recommendation for the STi. I purchased their Limited Slip Friction Modifier but it wasn't necessary to add any. No more chatter.

In the transmission I first tried ShockProof but it caused stiffer shifting. I now run 75W90NS as recommended by RLO, and shifting is smooth and easy.

Some people run OEM and are happy. I choose to use RLO. I've run track days in 100+ ambient and autox in 110+ ambient. I change out both gear fluids every year. I used to use this car for frequent track days and autox, though in the last year it's only been autox. Total mileage is 36,000.

If you're asking about MPG I can't be certain as I only use 100 octane and never run through a tank that doesn't include at least one event. Still it's around 19 combined, putting down 325whp/340wtq.
Quote:
Originally Posted by STirish View Post
Why? Can you talk about the benefits/cons you have seen vs. running a stock fluid or a fluid with a friction modifier. Any diff issues to report. What kind of mileage and use have been put on the car?
Rob
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Old 10-02-2009, 02:20 PM   #8
STirish
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Quote:
Originally Posted by gregr01 View Post
Been covered in this forum more than once previously--see this thread for good info and opinions.

Before going with RLO I spoke with one of their engineers (Dave). As I posted back in '05:
I've tried Red Line ShockProof Heavy and LightWeight Gear Oil in the rear diff and they both caused chatter. Went to their standard 75W90 after contacting RLO directly--this was their specific recommendation for the STi. I purchased their Limited Slip Friction Modifier but it wasn't necessary to add any. No more chatter.

In the transmission I first tried ShockProof but it caused stiffer shifting. I now run 75W90NS as recommended by RLO, and shifting is smooth and easy.

Some people run OEM and are happy. I choose to use RLO. I've run track days in 100+ ambient and autox in 110+ ambient. I change out both gear fluids every year. I used to use this car for frequent track days and autox, though in the last year it's only been autox. Total mileage is 36,000.

If you're asking about MPG I can't be certain as I only use 100 octane and never run through a tank that doesn't include at least one event. Still it's around 19 combined, putting down 325whp/340wtq.
I'm more curious about the front and center differentials and how they react to the 75W90NS. My front/center diffs currently bind up/chatter when turning at a slowly rate of speed. I'm curious about a quantitative advantage of running the NS fluid when it comes to how well the differential work vs. the accelerated wear that will be accounted.

So far I have been unable to qualify any gains running the straight NS vs. something with a friction modifier.

Keep in mind this is my race car, I'm only concerned about how well the car works and how long the parts last

Rob
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Old 10-02-2009, 03:18 PM   #9
gregr01
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Fully-built road race car I'd be trying out Redline Heavy Shockproof (Jamie aka Subie Gal uses it as well, or at least used to).

Multi-use track/autox/street I still think 75W90NS is best (or OEM if you prefer).

'04 STi uses a different front LSD than '06 (I believe) so YMMV.
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Old 10-02-2009, 04:46 PM   #10
GrantC
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The shockproof shouldn't be used in a transmission with an internal filter... AKA. it's fine in the 5MT but a no-no in the 6MT.
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Old 10-04-2009, 12:23 AM   #11
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Amsoil's Severe Gear does come in 75w110 and 75w140 if you're seeking a little more protection.

Redline Shockproof is a good option too as that's sort of its specific gearing.
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Old 10-04-2009, 02:07 AM   #12
kh15
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i have been running redline 75w90ns in my tranny for over 30k! Its just like engine oil debates, its just personal preference! try it out and if you dont like it, switch!
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Old 01-01-2014, 12:48 AM   #13
gregr01
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Reviving this oldie with new observations... it was easier to have the dealer swap OEM gear oil... that was the worst 12+ months I've ever endured. Balky shifting in the hot or cold, whether the car was warmed up or not. Terrible.

Swapped back to RLO ns in the tranny yesterday and it's back to smooth and slick action, and this in a transmission with 53k and hard autox and track day use.

For my '04 STi, the difference is remarkable, and I continue to recommended RLO.

+1 very happy customer. :-)
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