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⚙️ Shift smarter, drive smoother — the ultimate gear oil upgrade!
Red Line 50304 MT-90 is a premium synthetic 75W-90 GL-4 manual transmission and transaxle lubricant designed to protect gears and extend synchronizer life. Its unique formula ensures quicker, smoother shifts even in cold conditions while being safe for brass synchros by eliminating harmful reactive sulfurs. Trusted since 1979, this 4-pack quart set is perfect for GL-1, GL-3, and GL-4 applications, delivering top-tier performance and reliability for discerning automotive enthusiasts.






| ASIN | B003P550IE |
| Best Sellers Rank | #37,466 in Automotive ( See Top 100 in Automotive ) #64 in Gear Oils |
| Brand Name | Red Line Oil |
| Compatible Material | Brass |
| Container Type | Bottle |
| Customer Reviews | 4.8 4.8 out of 5 stars (443) |
| Item Form | Fluids,Oil |
| Liquid Volume | 128 fluid ounces |
| Manufacturer | Red Line |
| Material | Synthetic |
| Model Number | 50304 |
| Number of Items | 4 |
| Number of Packs | 4 |
| Part Number | 50304 |
| Recommended Uses For Product | Gear Oil |
| SAE J300 Viscosity Grade | 75W-90 |
| UPC | 737534816608 |
| Unit Count | 128 Fluid Ounces |
| Viscosity | 75W90 |
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