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.

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.

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.

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

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⚙️ Shift smarter, drive smoother — the ultimate gear oil upgrade!

TRUSTED LEGACY - From Red Line, a brand synonymous with uncompromising performance since 1979.
COLD START PERFORMANCE - Maintains smooth operation even in low temperatures, no more sluggish gear changes.
VERSATILE COMPATIBILITY - Meets GL-1, GL-3, and GL-4 specs, perfect for a wide range of manual transmissions.
PRECISION GEAR PROTECTION - Advanced synthetic formula extends synchro and gear life under high stress.
SEAMLESS SHIFTING EXPERIENCE - Optimized friction coefficient eliminates notchy shifts for effortless control.

Red Line50305 MT-90 is a premium synthetic 75W-90 GL-4 manual transmission lubricant designed to protect gears and synchros, ensure quicker, smoother shifts even in cold conditions, and is compatible with GL-1, GL-3, and GL-4 applications. Trusted since 1979, it delivers superior performance without compromising component longevity.

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Material	Synthetic
Brand	Red Line
Package Information	Bottle
Liquid Volume	128 Fluid Ounces
Recommended Uses For Product	Lube
Specific Uses For Product	Manual transmissions and transaxles
Item Form	Fluids,Liquid,Oil
Global Trade Identification Number	00083522503051
Manufacturer	Red Line
Unit Count	128.0 Fluid Ounces
UPC	083522503051
Number of Items	1
Model	50305
Item Weight	0.634 ounces
Product Dimensions	7.5 x 4 x 11.25 inches
Item model number	50305
Is Discontinued By Manufacturer	No
Manufacturer Part Number	50305
OEM Part Number	50305

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

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