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⚙️ Shift Smooth, Drive Confident: The Gold Standard in Manual Transmission Lubricants
Red Line MT-90 is a premium 75W-90 GL-4 manual transmission and transaxle lubricant designed to provide superior gear protection, eliminate notchy shifting, and maintain optimal synchronizer friction. It excels in both cold and high-temperature conditions (up to 300°F), making it ideal for vintage and modern manual transmissions requiring GL-1, GL-3, or GL-4 oils. Highly rated by users, it’s the trusted choice for enthusiasts seeking smooth, reliable shifting and long-lasting transmission health.
| ASIN | B00NT5V8RW |
| Best Sellers Rank | #76,046 in Automotive ( See Top 100 in Automotive ) #798 in Automotive Oils |
| Brand Name | Red Line |
| Container Type | Bottle |
| Customer Reviews | 4.9 4.9 out of 5 stars (569) |
| Item Form | Oil |
| Item Weight | 903 g |
| Liquid Volume | 64 Fluid Ounces |
| Manufacturer | Red Line |
| Model Number | 50304 |
| Number of Items | 1 |
| Part Number | 50304 |
| Recommended Uses For Product | Gear Oil |
| SAE J300 Viscosity Grade | 10W-40 |
| Specific Uses For Product | Manual transmissions and transaxles, GL-1, GL-3, and GL-4 applications |
| UPC | 737534816592 |
| Unit Count | 64 Fluid Ounces |
| Upper Temperature Rating | 300 Degrees Fahrenheit |
| Viscosity | 75W90 |
R**S
Not much to say it is what it is cheaper than local auto parts store got here quickly
A**A
Works great
B**N
For Vintage transmissions such as the 1991 Toyota Celica GT-S S53 transmissions, do not use API Gl-5 gear oil. Only use API Gl-4. My rebuilt transmission had Gl-5 and was giving me problems: Excerpts from AI: Type: API GL-4 (Strictly recommended) • ⚠️ WARNING: Do NOT use "GL-5" or "GL-4/GL-5 Compatible" generic gear oils found at most auto parts stores (like Mobil 1 LS). The high sulfur additives in GL-5 attack the brass synchros in Toyota transmissions, causing notchy shifting and premature wear. • Top Recommendations: • Redline MT-90 (The "gold standard" for this transmission) • Amsoil Manual Transmission & Transaxle Gear Lube 75W-90 • Toyota Genuine Manual Transmission Gear Oil (GL-4) 1. The "Washing" Phase The reason it feels like it is "getting smoother" mile by mile is that the Red Line MT-90 is actively scrubbing the old GL-5 film off the synchronizers. • The GL-5 Film: Remember, that Mobil 1 stuff was "too slippery." It left a slick coating on the brass rings. • The New Friction: Every time you shift now, the fresh MT-90 is displacing that old slippery film. The more you shift, the more "bite" the brass gets back. It will likely keep getting better for the next 50–100 miles. Also added was the Redline lightweight "Shockproof.” Why, because I have a slight internal bearing noise, and could be related the wrong API Gl-5 gear oil. After adding, the slight bearing noise appears to be gone.. But that’s another review.
D**Y
I used it on my Miata ND2. It works well when the temperature is high (e.g. 20 degree C), but when I cold start the car at 0 degree C, it is very hard to shift from 1st to 2nd gear. I will say do not use this oil if you use it for daily drive and in cold whether (< 0 degree C). Miata ND OEM should be 75W80, so I switched to Redline MTL.
Z**.
Packed much nicer then the other bottle has plastic bag over it no spilling hope it works as good as it says it does
Trustpilot
5 days ago
2 weeks ago