--- product_id: 5797130 title: "Red Line 80301 Limited Slip Friction Modifier - 4 Ounce" brand: "red line" price: "111.23 DT" currency: TND in_stock: true reviews_count: 13 category: "Red Line" url: https://www.desertcart.tn/products/5797130-red-line-80301-limited-slip-friction-modifier-4-ounce store_origin: TN region: Tunisia --- # Boosts differential efficiency for better mileage High viscosity-index for stable performance Engineered for superior wear protection Red Line 80301 Limited Slip Friction Modifier - 4 Ounce **Brand:** red line **Price:** 111.23 DT **Availability:** ✅ In Stock ## Summary > 🛠️ Elevate your ride’s grip and efficiency — don’t let chatter hold you back! ## Quick Answers - **What is this?** Red Line 80301 Limited Slip Friction Modifier - 4 Ounce by red line - **How much does it cost?** 111.23 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/5797130-red-line-80301-limited-slip-friction-modifier-4-ounce) ## Best For - red line enthusiasts ## Why This Product - Trusted red line brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted Legacy:** Red Line’s proven formula since 1979 delivers uncompromising performance and protection - • **Thermal Stability:** High viscosity-index ensures consistent film thickness across temperature swings - • **Universal Compatibility:** Works seamlessly with both synthetic and petroleum gear oils - • **Precision Friction Control:** Add 1oz increments to eliminate differential chatter and optimize traction - • **Extended Maintenance Intervals:** Enhances differential longevity with longer drain intervals ## Overview Red Line 80301 Limited Slip Friction Modifier is a premium 4-ounce additive designed to improve differential efficiency by reducing chatter and wear. Engineered with a high viscosity-index, it maintains consistent performance across temperature changes and is compatible with both synthetic and petroleum gear oils. Trusted since 1979, it extends differential life and enhances mileage, making it a must-have for performance-focused drivers. ## Description Product description Review: 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. Review: 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. ## Features - ENGINEERED - to provide the highest degree of protection and improvement of differential efficiency for better mileage, longer drain intervals, and less wear - DIRECTION - Add 1oz at a time to clutch-type limited slip or posi-traction units to eliminate chatter - HIGH VISCOSITY-INDEX - to provide relatively constant viscosity and film thickness with varying temperature change, exceed API GL-5 specifications - COMPATIBLE WITH - both petroleum and synthetic gear oils - WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000CPCBGE | | Best Sellers Rank | #91,760 in Automotive ( See Top 100 in Automotive ) #101 in Engine & Oil Fluid Additives | | Brand | Red Line | | Brand Name | Red Line | | Container Type | Bottle | | Customer Reviews | 4.4 out of 5 stars 303 Reviews | | Global Trade Identification Number | 00083522803014 | | Included Components | Per Item Description | | Item Form | Oil | | Liquid Volume | 4 Fluid Ounces | | 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 | Anti-Friction | | UPC | 083522803014 | | Unit Count | 4.0 Fluid Ounces | | Viscosity | High | | Viscosity Level | High | ## Product Details - **Brand:** Red Line - **Liquid Volume:** 4 Fluid Ounces - **Material:** Polytetrafluoroethylene - **Package Information:** Bottle - **Recommended Uses For Product:** Anti-Friction ## Images ![Red Line 80301 Limited Slip Friction Modifier - 4 Ounce - Image 1](https://m.media-amazon.com/images/I/71auZeP6jKL.jpg) ![Red Line 80301 Limited Slip Friction Modifier - 4 Ounce - Image 2](https://m.media-amazon.com/images/I/81TPVqxAqeL.jpg) ![Red Line 80301 Limited Slip Friction Modifier - 4 Ounce - Image 3](https://m.media-amazon.com/images/I/810gACQMFNL.jpg) ![Red Line 80301 Limited Slip Friction Modifier - 4 Ounce - Image 4](https://m.media-amazon.com/images/I/81owXIUH2ML.jpg) ![Red Line 80301 Limited Slip Friction Modifier - 4 Ounce - Image 5](https://m.media-amazon.com/images/I/81KJh4T38wL.jpg) ## Questions & Answers **Q: Would the 95 Isuzu 4x4 front differential benefit from this additive? I know the rear limited slip diff does!** A: No, unless it's a limited slip after market and specifies such. On the rear positive, too much would cause slippage between the plates. Just ad enough to stop the clanging. Too much would lesson the Limited slip . **Q: Can this be used in redlline dct fluid that is used in a manual tranmission with lsd?** A: It was purchased for my son. I didn't use it. My son is a car mechanic, so I think it is a good product. **Q: Would this help a 95 Isuzu front 4x4 differential? ...that chatters around corners on pavement?** A: Check your u-joints but if there ok. Let me know if it worked. Differential Gear oil is supposed to be replaced on a regular Preventative maintenance Schedule. I don’t know what the mileage is on your car is but it couldn’t hurt “unless your vehicle is not a LSD Diff.” Thanks! **Q: do I need that for my 99 chevy express 1500 V8 with amsoil 80W90 together?** A: My chevy Silverado 2500HD ran better after adding a 4oz. can of Redline with the rear gear oil. There is also an additive for the transfer case GM put in during a service. I would double check before putting that in the transfer case. Keep on reading, you'll find the answer. Good Luck ## Customer Reviews ### ⭐⭐⭐⭐⭐ This is a review of the seller not the product. *by D***S on August 11, 2022* 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. ### ⭐⭐⭐⭐⭐ Works great in my Ford 8 *by A***W on August 11, 2014* 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. ### ⭐⭐⭐⭐⭐ Add 1 Ounce then do several figure 8's in a parking lot. *by J***N on December 10, 2023* Worked like a charm but you have to spend 20 minutes doing figure 8's at slow speed. Solved the drag sound. ## Frequently Bought Together - Red Line 80301 Limited Slip Friction Modifier - 4 oz. - Sealey AK54 550ml Oil Suction Syringe, Multicoloured --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/5797130-red-line-80301-limited-slip-friction-modifier-4-ounce](https://www.desertcart.tn/products/5797130-red-line-80301-limited-slip-friction-modifier-4-ounce) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-05-31*