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Red Line 75W90NS Gear Oil 1QT (Part Number: )
Red Line 75W90NS Gear Oil 1QT (Part Number: )
Red Line 75W90NS Gear Oil 1QT
Read 5 Reviews | Q&A
Part # 58304

In stock! Ships same day
Universal part

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Features & Product Details

Red Line's Gear Lubricants are designed to provide the highest degree of protection and greatest efficiency for your drive train. Red Line provides a complete line of drive train lubricants which are optimized for differential, transmission, or transaxle use over a wide range of temperatures. Proper selection depends upon the manufacturers' requirements and whether the application is for passenger automotive, commercial, or racing use. Red Line Gear Oils contain polyol ester base stocks to provide excellent lubrication even under extreme conditions of high-loading and high- temperatures--their natural lubricity provide excellent slipperiness which reduces the sliding friction in hypoid gears to reduce wear and temperatures. The synthetic base stocks have a natural multi-grade property, so large amounts of unstable thickeners are not required to manufacture their gear oils, which means that Red Line Gear Oils will provide a stable viscosity for even extended periods of use. Red Line also manufactures gear oils which can be used in limited-slip differentials without the use of additional friction modifiers.

The Red Line 70W90NS is a GL-5-type gear oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials when weak spring design causes too much wheel spin.

This oil is recommended for Subaru manual transmissions.


Brand: Red Line
Class: GL5
Friction Modifier: No
Type: Synthetic
Volume: 1 qt
Color: Yellow
Mfgr. Warranty: No Warranty
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
WARNING: Cancer and Reproductive Harm -



5 Reviews
3.6 out of 5 Stars
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
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Great Product 3 years ago
5out of 5stars

Put this in my 2005 STi and I noticed that it shifts a lot nicer than before. I read a lot of great reviews on this product which led me to by it and I'm very happy with the decision.
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No good 5 years ago
2out of 5stars

Did not work in my wrx's 5spd. Not long after I put it in I had trouble shifting gears mainly 2nd to 3rd. After about 10k I drained it out and the fluid looked terrible almost milky like it had broken down. I filled with extra-s and the trans shifts perfect again. Didn't work for me.
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1 of 1 people found the following review helpful
No good for an STi 6 years ago
1out of 5stars

I recently changed the fluid in the transmission on my 2006 STi from the OEM fluid to this Redline 75w90ns fluid. Initially there seemed to be no difference, but after 4 or 5 days I began to hear a metal on metal sound coming from the transmission. After 7 days I couldn't stand the sound any longer, so I replaced the fluid with OEM fluid from the dealership. I don't know if this fluid did any damage to the drive controlled center differential (DCCD), but just to be safe I will keep the fluid OEM.
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Great Fluid 7 years ago
5out of 5stars

Heard that many other people used redline in their wrx. Gave it a try, tranny shifts smoother than ever before. Would Defiantly recommend filling up with redline during your next trans flush.
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Seems to work fine 7 years ago
5out of 5stars

I've ran a couple thousand miles with about 4 quarts of this in my WRX's tranny. Noticed it was slightly easier to shift after the change, but that can probably contributed to the old fluid. Will see how it performs now that it's getting below freezing.
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Please verify compatibility before purchase. May require some modification for proper installation.