Red Line MT – 90 Gear Oil 75 W90 GL – 4 , model: 50305

Red Line MT – 90 Gear Oil 75 W90 GL – 4 , model: 50305

Q: Can you mix gl-4 gear oil with gl-5 gear oil? what is difference? if do 50/50....will be good together? why or why not?

NO NO NO... GL-4 is specific for older transmissions that have bronze/brass parts. GL-5 will DESTROY these parts.. believe me I know from experience. My local speed shop mistakenly gave me GL-5 for my 91 YJ with the X-5 trans. Within ten miles I could smell the problem happening. They honored the mistake and gave me a gallon of correct GL-4 so at 150K my X5 was shifting much better. It's in the shop now at 185K for a trans rebuild (yeah it lasted THAT long) and Troy Transmissions was pleased to hear I wanted Redline. He insists on synthetics for Arizona heat and drivers who get in extreme conditions, look up the "back way to Crown King" for an idea of our kind of fun. And a heads up for the Y owners... beware the fast lube places. I went to two different shops and BOTH insisted GL-5 was the correct lube!!! NOT! Luckily the $450 they wanted just to change fluids scared me off and I did what Jeepers should do... work on your own rig yourself.

Q: why do many say to not change the old gear oil & that the "gunk" in old gear oil makes transmssion last longer & might have problems with new gear oil

What they are referring to is automatic transmission fluid. Automatic transmissions have a series of "bands" with clutch like materials bonded to the friction side. On a worn out automatic transmission, the friction materials on these bands are already smoothed out and slip. Since automatic transmission are driven by hydraulic pressure, the "gunk" suspended inside old fluid will help with "gripping" action with these band. This redline gear oil is used in Manual transmissions. The old saying would not apply here.

Q: Is MT 90 good for a 1995 jeep yj manual transmission?

Yes, great product; bought the vehicle used and it was not sure what type of fluid it had in the transmission. The jeep sounded like a bus and once I added the MT-90; big difference and most importantly much quietly.

Q: Is this product compatible with my 1975 vw beetle, type 1 which spec's 85w/90 gl-4 gear oil? or do you have a synthetic product that is?

I would look on the Volkswagen site or call a Volkswagen service department you can fool around with weights on engine oil but I wouldn't put the wrong weight in on a transmission

4.8/5

ID del producto: 724925715

Transacción segura

Detalles

Material
Synthetic
Brand
Red Line
Package Information
Can
Liquid Volume
128 Fluid
Item Weight
2.27 Kilograms

⚙️75W90 viscosity for optimal gear protection

❄️Cold-weather synchro friction control

🛡️GL-4 safe, no reactive sulfur damage

Comprados juntos con frecuencia

Red Line 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon

Slippery Pete Fluid Pump for Gallon Bottles and Wide Mouth Quart Bottles (Not for Standard Quart Bottles) - Transfer Gear Oil, Transmission and Differential Fluid, Antifreeze with This 30cc Hand Pump

Red Line 57905 75W90 GL-5 Synthetic Gear Oil for Hypoid Limited Slip Differentials - 1 Gallon

Descripción

⚙️ Shift Smooth, Drive Confident: Gear Oil That Means Business

TRUSTED LEGACY - Backed by Red Line’s 40+ years of high-performance lubrication expertise—no compromises.
COLD WEATHER READY - Optimized friction coefficient prevents notch shifting even in freezing conditions—no more gear grind.
SYNCHRO SAFE FORMULA - GL-4 rated and free from reactive sulfur, protecting brass synchronizers from premature wear.
VERSATILE COMPATIBILITY - Perfect for GL-1, GL-3, and GL-4 applications, fitting seamlessly into your vehicle’s maintenance routine.
PRECISION GEAR PROTECTION - Advanced 75W90 viscosity ensures peak performance and longevity for your drivetrain.

Red Line MT-90 Gear Oil 75W90 GL-4 (model 50305) delivers high-performance gear protection with a specialized formula that prevents cold-weather shifting and protects brass synchronizers. Trusted since 1979, it meets GL-1, GL-3, and GL-4 standards without reactive sulfur, ensuring durability and smooth operation for professional-grade vehicles.

Presupuesto

Manufacturer	Red Line
Brand	Red Line
Model	50305
Product Dimensions	19.05 x 10.16 x 28.58 cm; 2.27 kg
Item model number	50305
Is Discontinued By Manufacturer	No
OEM Part Number	50305
Item Dimensions L x W x H	19.1 x 10.2 x 28.6 cm
Item Weight	2.27 Kilograms

¿Tienes una pregunta? Mira lo que otros preguntaron

Can you mix gl-4 gear oil with gl-5 gear oil? what is difference? if do 50/50....will be good together? why or why not?

why do many say to not change the old gear oil & that the "gunk" in old gear oil makes transmssion last longer & might have problems with new gear oil

Is MT 90 good for a 1995 jeep yj manual transmission?

Is this product compatible with my 1975 vw beetle, type 1 which spec's 85w/90 gl-4 gear oil? or do you have a synthetic product that is?

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El producto coincide exactamente con la descripción. Muy satisfecho con mi compra.

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