LS 3025 front axel fluid

   / LS 3025 front axel fluid #1  

LS Mike

New member
Sep 27, 2021
LS XG 3025 h
My 2017 xg3025hd front axel requires 80w90 gl4 gear oil but i keep finding gl 5. What is the differance and can i use gl 5?
   / LS 3025 front axel fluid #2  
gl5 is better protection for extreme pressure I use synthetic in all my customers front axles my weed abatement guy is 1k hours a year
No problems
   / LS 3025 front axel fluid #3  

"They make GL4 gear oils with enough EP additives to protect spur and helical gears in manual transmissions. A GL4 will maintain the necessary balance of viscosity, detergency, and corrosion protection.

This type of oil is perfect for vehicle gear applications with high levels of yellow metals. An API GL5 gear oil has higher levels of active sulfur phosphorous, which will corrode yellow metals."

"A GL5 gear oil has about twice as much EP additive as a GL4, ensuring the greatest protection, performance, and efficiency for your hypoid gear system."

Thinking is that tractors rarely use yellow metals, so GL5 should be both just fine, and better than GL4 in that application. Like @Dman1981 I also use a synthetic GL5 in my front axle.
   / LS 3025 front axel fluid #4  
I have a 65 HP 4wd tractor that I abused....very rough 1st smoothing after plowing, bucket full of gravel to help to smooth out the ride.......I broke both front axle bearings. OEM front end oil was the same as in the hydro/tranny/differential. After fixing the problem, I installed 85w-140 and haven't looked back....that was 15 or so years ago.

Same company machine, 2016 year model rather than 2009 of the other tractor, 25 HP, 4wd, in the Operator's manual specs and molded in the plug that is used to check the front axle fluid it stated 90w.

Ok, having read on here where some folks have broken their front axles doing this and that I put 85w-140 in it here in N. Tx., had no problem with the thicker oil, have worked the tail off this little 25 hp and it too has had no problems.

Moral of this story as I see it, if the manufacturer some years later, changes the front axle oil on a 25 hp tractor vs a much larger 65 hp tractor from thin to thick there is obviously something to it and it needs to be heeded.....I did and haven't been sorry.

Yellow metal is in older transmissions, usually used for synchronizers of the steel gears and their shafts. I don't see a place for yellow metal in 4wd front ends so I see no reason to worry about GL-5 which is the rating of the heavy oil I currently use in my 4wd tractors and have had zero problems.
   / LS 3025 front axel fluid #5  
Just use THF & be done with it. Can be bought anywhere regular.
It's gl4 rated, Napa, Walmart, Fleets F, tractor supply. E-bay has many brands & free shipping.
   / LS 3025 front axel fluid #6  
GL-5 oil is a multi-purpose, extreme pressure gear lubricant for automobiles. It's made from a paraffinic base stock and contains additives that provide protection and extend the life of the lubricant. GL-5 oil is suitable for use in differentials that operate under high speed, low torque conditions, as well as low speed, high torque conditions. It's also recommended for hypoid and bevel gear sets in front and rear drive differentials.

Gear Oil GL-5 - Chevron
Gear Oil GL-5 are multipurpose lubricants. They are made from paraffinic base stocks and contain a balanced additive package to provide acceptable market general gear protection and lubricant life. The sulfur-phosphorus extreme pressure additive technology used in Gear Oil GL-5 provides good thermal and oxidation ...

CRC Industries

Sta-Lube API/GL-5 Pls New Gen Ltd SlipGear 80W90 1 Gal
Description. GL-5 Heavy Duty Gear Oil is an extreme pressure, multi-purpose, automotive gear lubricant. Excellent performance for differentials operating under high speed, low torque; and low speed, high torque conditions. It meets SAE, military and commercial specs.


ADVANTAGE GL-5 PREMIUM GEAR OILS ... ADVANTAGE GL-5 PREMIUM GEAR OILS are multipurpose, extreme pressure gear lubricants which are recommended for hypoid and bevel gear sets used in many front and rear drive differentials.