---
product_id: 4236533
title: "10121 SAE 75W-140 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart"
brand: "lucas oil"
price: "266 Lei"
currency: RON
in_stock: true
reviews_count: 13
category: "Lucas Oil"
url: https://www.desertcart.ro/products/4236533-10121-sae-75w-140-synthetic-gear-oil-transmission-and-differential
store_origin: RO
region: Romania
---

# Noise reduction additive for whisper-quiet gears High-temp stability for relentless heat resistance SAE 75W-140 viscosity for extreme performance 10121 SAE 75W-140 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart

**Brand:** lucas oil
**Price:** 266 Lei
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift into the future with Lucas Oil’s ultra-slick synthetic power!

## Quick Answers

- **What is this?** 10121 SAE 75W-140 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart by lucas oil
- **How much does it cost?** 266 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/4236533-10121-sae-75w-140-synthetic-gear-oil-transmission-and-differential)

## Best For

- lucas oil enthusiasts

## Why This Product

- Trusted lucas oil brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Noise-Reducing Additive:** Say goodbye to annoying gear chatter and enjoy smooth rides.
- • **Trusted by Heavy-Duty Pros:** Top-rated choice for high-performance and heavy-duty vehicles.
- • **High-Temperature Durability:** Maintains peak lubricity even under intense heat stress.
- • **Ultra-Slick Synthetic Formula:** Experience frictionless gear shifts and extended drivetrain life.
- • **Optimized for Limited Slip Differentials:** Engineered to protect and enhance limited slip performance.

## Overview

Lucas Oil 10121 SAE 75W-140 Synthetic Gear Oil is a premium, long-lasting lubricant designed for heavy-duty and high-performance vehicles. Its advanced synthetic formula reduces gear noise, extends bearing life, and withstands extreme temperatures, making it ideal for limited slip differentials and demanding driving conditions.

## Description

Lucas Pure Synthetic Gear Oils are super-slick, long lasting lubricants designed especially for heavy duty or high performance applications where regular gear lubricants just aren't good enough. They contain a special additive package that increases lubricity and insures less gear noise and longer bearing life. Designed to stand up to high temperatures without losing its lubricity. Excellent for use in limited slip differentials.

Review: Seems to work well - I needed to do a fluid change on the rear diff of my 2002 F150 with factory limited slip. I have never used any Lucas product before, only seen their oil additives (and I don't use additives at all, Lucas or other brands). I have read some bad reviews of Lucas gear oils, but most seem to be complaining of issues in transmissions or transfer cases, not differentials, so I figured why not try it. It meets all the specs and is cheaper than other synthetic fluids of the same viscosity (even cheaper than Supertech 75w-140 synthetic from Walmart). I did notice this fluid does not have as strong a foul odor like some gear oils do. It still smelled, but not as bad as others I have used before. I changed the fluid with no major issues and it seems to work just fine. I did add the Motorcraft XL-3 Friction Modifier to the differential. The Lucas fluid is supposed to contain Friction Modifier and it says no need to add more, but I have heard of many people having rear end chatter with the OEM Ford LS no matter what fluid is used unless the Ford friction modifier is added too, so I did it. I was having some chattering from the rear end when doing sharp turns from a stop before I changed the fluid, no issues at all after the change. I only gave it 4 stars for now since I don't know long term how this fluid holds up. If it is still good in a year, I will change it to 5 stars. As of right now, I would not hesitate to use it again. Edit 7/10/15: Well, it is a year later and nothing to report except truck is still running fine with no noise or leaks from the rear end. Seems like a solid choice for gear oil for me. Will be on the top of my list if I need more. 5 star rating now. another edit 9/16/16: well, no more updates on this fluid. I had to drain my rear diff (had to replace the anchor plate for the passenger side brake caliper, which requires removing the axle shaft and draining the fluid). I debated re-using the fluid, but decided not too. The fluid came out looking almost like it went in. Only had 10,000 miles or so on it though. I did not use more Lucas fluid for the refill, I just went with some Supertech gear oil from Walmart instead. Seems the price of the Lucas has gone up and cost as much as other name brand fluids, loosing its biggest advantage for me (low cost).
Review: Lucas is some of the best. - Never go to a dealership to buy this type of product. The double mark-up on price is sad. This is better than original, and was used in a Posi diff.

## Features

- Super-slick long lasting lubricant
- Insures less gear noise and longer bearing life
- Stands up to high temperatures while maintaining lubricity

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000BCKWVE |
| Best Sellers Rank | #22,541 in Automotive ( See Top 100 in Automotive ) #5 in Heavy Duty Vehicle Oils #252 in Motor Oils |
| Brand | Lucas Oil |
| Customer Reviews | 4.8 4.8 out of 5 stars (748) |
| Date First Available | September 15, 2005 |
| Exterior | Machined |
| Global Trade Identification Number | 00049807101213 |
| Is Discontinued By Manufacturer | No |
| Item Form | Oil |
| Item Weight | 1.98 pounds |
| Item model number | LUC10121 |
| Liquid Volume | 1 Quarts |
| Manufacturer | Lucas Oil |
| Manufacturer Part Number | LUCA10121 |
| Material | Blend |
| Model | Lucas Oil 10121 Synthetic SAE 75W-140 Gear Oil - 1 Quart |
| Number of Items | 1 |
| OEM Part Number | 10121 |
| Package Information | Bottle |
| Product Dimensions | 3.3 x 3.3 x 11.75 inches |
| Recommended Uses For Product | auto racing |
| Specific Uses For Product | Vehicle |
| UPC | 049807401214 |
| Unit Count | 32.0 Fluid Ounces |
| Upper Temperature Rating | 1 Kelvin |
| Viscosity | 75W-140 |

## Product Details

- **Brand:** Lucas Oil
- **Liquid Volume:** 1 Quarts
- **Material:** Blend
- **Package Information:** Bottle
- **Recommended Uses For Product:** auto racing

## Images

![10121 SAE 75W-140 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart - Image 1](https://m.media-amazon.com/images/I/61gA8zEIi4L.jpg)

## Questions & Answers

**Q: so this can be used in rear axle and also in gear box? is that right ?**
A: I used it in the rear axle (which technically contains gears). You cannot use this in the transmission

**Q: Can use in worm gear saw?**
A: Can you be more specific to your use of the oil? Are you wanting to use to lubricant the tool? Or to use as a cutting lubricant?

**Q: Is this okay to use on a regular differential(non limited slip)?**
A: I believe so.

**Q: Can this be used on Differential 2021 toyota corolla manual??**
A: Yes

## Customer Reviews

### ⭐⭐⭐⭐⭐ Seems to work well
*by N***1 on June 26, 2014*

I needed to do a fluid change on the rear diff of my 2002 F150 with factory limited slip. I have never used any Lucas product before, only seen their oil additives (and I don't use additives at all, Lucas or other brands). I have read some bad reviews of Lucas gear oils, but most seem to be complaining of issues in transmissions or transfer cases, not differentials, so I figured why not try it. It meets all the specs and is cheaper than other synthetic fluids of the same viscosity (even cheaper than Supertech 75w-140 synthetic from Walmart). I did notice this fluid does not have as strong a foul odor like some gear oils do. It still smelled, but not as bad as others I have used before. I changed the fluid with no major issues and it seems to work just fine. I did add the Motorcraft XL-3 Friction Modifier to the differential. The Lucas fluid is supposed to contain Friction Modifier and it says no need to add more, but I have heard of many people having rear end chatter with the OEM Ford LS no matter what fluid is used unless the Ford friction modifier is added too, so I did it. I was having some chattering from the rear end when doing sharp turns from a stop before I changed the fluid, no issues at all after the change. I only gave it 4 stars for now since I don't know long term how this fluid holds up. If it is still good in a year, I will change it to 5 stars. As of right now, I would not hesitate to use it again. Edit 7/10/15: Well, it is a year later and nothing to report except truck is still running fine with no noise or leaks from the rear end. Seems like a solid choice for gear oil for me. Will be on the top of my list if I need more. 5 star rating now. another edit 9/16/16: well, no more updates on this fluid. I had to drain my rear diff (had to replace the anchor plate for the passenger side brake caliper, which requires removing the axle shaft and draining the fluid). I debated re-using the fluid, but decided not too. The fluid came out looking almost like it went in. Only had 10,000 miles or so on it though. I did not use more Lucas fluid for the refill, I just went with some Supertech gear oil from Walmart instead. Seems the price of the Lucas has gone up and cost as much as other name brand fluids, loosing its biggest advantage for me (low cost).

### ⭐⭐⭐⭐⭐ Lucas is some of the best.
*by C***. on March 23, 2025*

Never go to a dealership to buy this type of product. The double mark-up on price is sad. This is better than original, and was used in a Posi diff.

### ⭐⭐⭐⭐⭐ Works Well
*by J***I on November 26, 2025*

Does the job. No issues. Used in race transmissions and seems to work well.

## Frequently Bought Together

- Lucas Oil 10121 SAE 75W-140 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart
- Lucas Oil 10047 SAE 75W-90 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart
- Lucas Oil 10122 Synthetic SAE 75W-140 Gear Oil - 1 Gallon

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.ro/products/4236533-10121-sae-75w-140-synthetic-gear-oil-transmission-and-differential](https://www.desertcart.ro/products/4236533-10121-sae-75w-140-synthetic-gear-oil-transmission-and-differential)

---

*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-04*