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Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon by Red Line Oil

Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon by Red Line Oil

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: 53635750

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Details

Brand
Red Line
Package information
Bottle
Liquid volume
128 Fluid
Item form
Liquid Oil
Global Trade Identification Number

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

Description

Specifications

Manufacturer	Oeream
Part number	50305
Item Weight	2.27 kg
Product Dimensions	19.05 x 10.16 x 28.58 cm; 2.27 Kilograms
Item model number	50305
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No

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

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Excellent communication throughout the order process. Product is perfect.

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TrustScore 4.5 | 7,300+ reviews

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