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Red Line50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon

Red Line50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon

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

Product ID: 269584796

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Details

Material
PU
Brand
Red Line
Package information
Bottle
Liquid volume
128 Fluid
Recommended uses for product
Lube

🚗Optimized for manual transmissions & transaxles

⚙️75W90 GL-4 viscosity grade

❄️Smooth shifting even in cold temps

Frequently Bought Together

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

Description

⚙️ Shift smoother, drive smarter — never settle for less!

SILENT PERFORMANCE - Eradicates gear whine and rattle under high heat
COLD START CONFIDENCE - Ensures smooth gear changes even at low temperatures
ULTIMATE GEAR PROTECTION - Non-corrosive formula guards synchronizers and gears
ENGINEERED FOR MANUAL MASTERY - Specifically designed for manual transmissions and transaxles
EFFORTLESS SHIFTING EVERY TIME - Eliminates notchy shifting with perfect friction balance

Red Line 50305 MT-90 is a premium 75W90 GL-4 gear oil engineered for manual transmissions and transaxles. It delivers superior gear and synchronizer protection, eliminates notchy shifting, and maintains excellent shifting performance even in cold conditions. Its advanced formula reduces gear noise and prevents corrosion, making it the go-to lubricant for high-performance manual drivetrains.

Specifications

Brand	Red Line
Product Dimensions	19.05 x 10.16 x 28.58 cm; 18 g
Item model number	50305
Manufacturer Part Number	50305
OEM Part Number	50305
Item Weight	18 g

Have a Question? See What Others Asked

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?

Common Questions

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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$1324

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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