does this have the friction modifier already in it for limited slip rears?

No, if your differential calls for the additive, you have to add some anyways. This is the case with dodge differentials 8.25" and 9.25" in the rears with limited slip. The OEM manual should say to add it if its limited slip or has trak-lok. Excerpt from manual "Trac-lok™ equipped axles require a friction modifier be added to the lubricant."

I have a G80 locker differential in my 99 silverado and not limited slip. Is this the correct stuff?

yes, for use with or without limited slip

I have a 1980 350 chevy dump truck.. can I use this fro gear oil??

Yes you can, it is a synthetic gear oil and also designed for limited slip gearing.

what is best gear oil for1983 300d 123 mercedes . n.russell

Not knowing the specifications for gear oil *rear end oil" for Mercedes, which I expect will be the same as most every automobile since about 1990 or thereabouts, This Lucas oil is the best there is. Most auto manufactures spec oils and greases with "proprietary" numbers, but the product on the inside of the can has the same specifications pretty much.

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⚙️ Gear up with Lucas Oil – where precision meets power!

LIMITED SLIP READY - Optimized for limited-slip differentials to prevent chatter and enhance traction.
SYNTHETIC STRENGTH - Advanced synthetic blend delivers exceptional wear resistance and extended gear life.
COMPACT CONVENIENT - 1-quart bottle fits perfectly in your garage toolkit for quick, mess-free maintenance.
OEM REPLACEMENT CONFIDENCE - Directly replaces OEM part #10047 for seamless compatibility and reliability.
PRECISION VISCOSITY CONTROL - Engineered SAE 75W-90 ensures smooth shifting and peak transmission performance.

Lucas Oil 10047 SAE 75W-90 Synthetic Gear Oil is a premium synthetic blend designed for transmission and differential lubrication, especially in limited-slip differentials. Packaged in a convenient 1-quart bottle, it replaces OEM part #10047, delivering reliable, high-performance gear protection and smooth operation for your vehicle.

Reviews

R**6

Lucas quality

worked great in a rear end and a transfer case on a 2014 equinox awd

22.06.2025

D**D

The best

Great product

14.08.2025

B**

Little pricey

Good

6.08.2025

M**D

Good gear oil.

Quality gear oil as you would expect from Lucas.

28.07.2025

G**D

Works to help with burning oil

You need this for older cars. I have an older honda burnin oil and after using this for a couple oil changes it stopped. Highly recommend

16.07.2025

R**O

Good quality

Good stuff

6.05.2025

B**Z

Good value

Good value and shipped quickly

16.09.2025

W**R

Lucas oil is the bomb!

I like Lucas oil products. They work great! That’s why I use them on my truck.

21.04.2025

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Material	Blend
Brand	Lucas Oil
Package Information	Bottle
Liquid Volume	1 Liters
Item Weight	2 Pounds
Recommended Uses For Product	Vehicle
Viscosity	75W-90
Item Form	Oil
Global Trade Identification Number	00049807100476
Manufacturer	Lucas Oil
Unit Count	32.0 Fluid Ounces
UPC	049807400477
Number of Items	1
Model	051-507
Item Weight	2.03 pounds
Product Dimensions	3.25 x 3.25 x 3.25 inches
Item model number	051-507
Is Discontinued By Manufacturer	No
Manufacturer Part Number	051-507
OEM Part Number	10047

Lucas Oil10047 SAE 75W-90 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart

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