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⚙️ Shift smarter, drive smoother — the ultimate gear oil upgrade!
Red Line 50304 MT-90 is a premium 75W-90 GL-4 manual transmission lubricant designed to protect gears and extend synchronizer life. Its unique friction formula ensures quicker, smoother shifts even in cold conditions, while being safe for brass synchros by avoiding harmful reactive sulfurs. Trusted since 1979, this 4-pack offers professional-grade performance for GL-1, GL-3, and GL-4 applications, making it the go-to choice for discerning drivers who demand reliability and longevity from their vehicle fluids.






| ASIN | B000QFN326 |
| Best Sellers Rank | #127,634 in Automotive ( See Top 100 in Automotive ) #145 in Gear Oils |
| Brand Name | Red Line |
| Compatible Material | Brass |
| Container Type | Bottle |
| Customer Reviews | 4.8 4.8 out of 5 stars (77) |
| Included Components | (1063017) MT-90 75W90 GL-4 - QUART |
| Item Form | Oil |
| Item Type Name | ENGINE OIL |
| Item Weight | 2 pounds |
| Liquid Volume | 128 fluid ounces |
| Manufacturer | Red Line |
| Model Number | 50304 |
| Number of Items | 4 |
| Number of Packs | 4 |
| Part Number | 50304 |
| Recommended Uses For Product | Automotive |
| SAE J300 Viscosity Grade | 75W-90 |
| Unit Count | 128 Fluid Ounces |
| Viscosity | 75W-90 |
| Warranty Description | LIMITED WARRANTY |
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