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⚡ Silence the chatter, unleash the power.
Redline 80301 Limited Slip Friction Modifier is a high-viscosity additive designed to optimize limited-slip differentials by reducing noise and wear, extending oil drain intervals, and maintaining consistent performance across temperature extremes. Compatible with all gear oils, it’s the trusted choice since 1979 for professional-grade differential tuning.






| ASIN | B000CPCBGE |
| Best Sellers Rank | 48,162 in Automotive ( See Top 100 in Automotive ) 29 in Agricultural Vehicle Oils & Fluids |
| Brand | Red Line |
| Brand Name | Red Line |
| Container Type | Bottle |
| Customer Reviews | 4.6 out of 5 stars 300 Reviews |
| Global Trade Identification Number | 00083522803014 |
| Item Form | Oil |
| Liquid Volume | 4 Fluid Ounces |
| Liquid volume | 4 Fluid Ounces |
| Lower Temperature Rating | 10 Degrees Celsius |
| Manufacturer | Red Line |
| Material | Polytetrafluoroethylene |
| Model Number | 80301 |
| Number of Items | 1 |
| Package information | Bottle |
| Part Interchange Info | 80301 |
| Part Number | 80301 |
| Recommended Uses For Product | Automotive |
| Recommended uses for product | Automotive |
| Specific Uses For Product | Limited-slip differential friction modification and break-in |
| UPC | 083522803014 |
| Unit Count | 4.0 millilitre |
| Upper Temperature Rating | 400 Degrees Fahrenheit |
| Viscosity | High |
| Viscosity Level | High |
G**E
Brillant stuff will buy again
Bought this as I have a Drexler plated diff and I’ve purchased various top brand gearbox oils but still had slight noise and chatter going round very tight corners. So I put in normal 75w 85 oil in and added a ounce at a time until noise and chatter had gone, I can say it has no noise what so ever and this is a brilliant product.
J**.
Worked a treat!
I fitted a limited slip differential gearbox to my mini which creaked and moaned and groaned when turning slowly. Added half a bottle of this to the oil in the gearbox and the problem was gone instantly.
A**R
works well
worked well stopped my lsd knocking
C**C
Perfect
Did the job
L**R
Didn’t work for me at all
Didn’t really make any difference to my jeep differential.
K**E
Good product, perfect for limited slip
Added to grand cherokee rear differential, worked as expected.
D**S
This is a review of the seller not the product.
As always Red Line is a top tier product. I use Red Line 75W90ns gear oil for the rear diff in the race car the ns in the oil name stands for Non-Limited Slip. That way I can add the Limited Slip Friction Modifier and I can fine tune the slip/grip that the rear tires get. This came from the Red Line store so I was fairly certain it would get to me on time. It was supposed to arrive in 5 to 7 days but it only took 2 days. None of my local stores had this in stock and it was going to be weeks before they could get it.
C**I
Muy bueno
Este modificador de frucción me ha ido fantástico en el diferencial autoblocante trac lok de mi grand cherokee zj. Se han acabado los ruídos que tenía porque se enganchaban.los discos. Aunque tenía aceite 75W140 especial para autoblocante, no hacía bien su función. Saqué 110ml de aceite y lo sustituí por este botecito, y mano de santo. Si tienes ruídos o crujidos raros en el autoblocante, no dudes en ponerlo, serás feliz
M**D
Erfüllt seinen Zweck - Redline 80301
Habe den Zusatz beim Ölwechsel meinem Limited Slip Differential beigemischt wie vorgegeben. Die Menge der (überraschend kleinen) Flasche enstpricht genau der vorgeschriebenen Menge (118ml). Konnte bislang keine Probleme feststellen, es erfüllt seinen Zweck.
A**W
Works great in my Ford 8
Works great in my Ford 8.8 Traction-Lok rear axle when mixed with Mobil 1 75W-140 synthetic gear oil. The spout meant well but wasn't long enough to pour into the axle fill hole; still had to use a pump like with the oil itself. Many synthetic gear oils claim they already have "limited slip additive" included, but it is usually not enough for optimal performance. If your vehicle says that a friction modifier additive is needed, then make sure you add some (might not need the whole 4 oz, but will probably need at least some) even if the gear oil says it's not needed.
Trustpilot
2 weeks ago
1 month ago