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โ๏ธ Shift into the fast lane with Red Lineโs ultimate gear oil!
Red Line 50104 is a full synthetic 75W85 GL-5 gear oil designed specifically for hypoid limited slip differentials. It features advanced friction modifiers for clutch-type LSDs, ensuring smooth operation without additional additives. Compatible with a wide range of vehicles including BMW, Ford, Lexus, and popular in high-performance racing applications, this 1-quart bottle delivers superior thermal stability, wear protection, and long-lasting performance trusted since 1979.






| ASIN | B000J3G8KE |
| Best Sellers Rank | #1,841 in Automotive ( See Top 100 in Automotive ) #5 in Gear Oils |
| Brand | Red Line |
| Brand Name | Red Line |
| Container Type | Bottle |
| Customer Reviews | 4.9 out of 5 stars 1,309 Reviews |
| Global Trade Identification Number | 00083522501040 |
| Included Components | 75W85 GL-5, Full Synthetic Gear Oil |
| Item Form | Oil |
| Item Type Name | ENGINE OIL |
| Item Weight | 650 g |
| Liquid Volume | 32 fluid ounces |
| Manufacturer | Red Line |
| Material | Synthetic |
| Model Number | RED50104 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Package Information | Bottle |
| Part Number | 50104 |
| Recommended Uses For Product | Vehicle |
| Specific Uses For Product | Vehicle |
| UPC | 083522501040 |
| Unit Count | 32 Fluid Ounces |
| Viscosity | 75W85 |
| Warranty Description | LIMITED WARRANTY |
C**I
Works great!
Excellent product
D**I
Always Good!
Works great for my 5th GEN 4Runner.
J**Y
Recliner gear oil.
My gear oil was shipped very quickly. Product was new exactly as described. Thank you
W**N
Great Product
I have used Red Line for years on my differential. Good product at a good price.
T**D
original Toyota is 75w85, and it is that rating for fuel economy reasons
worked for Toyota Sienna, same oil for front and rear transfer case. While 75w90 and above oils will work for this transfer case, original Toyota is 75w-85 which is very hard to find aftermarket, and only red line came up. difference with a heavier oil is that you will loose some fuel economy, but it is good for towing and probably hot weather. Many people buy the original Toyota but it is way too pricey. Changed my transfer case oils, front and rear, and and used about half a gallon. Old oil was dark, probably wasn't changed by previous owner (vehicle came from Maine, no surprise). With the redline oil now in the transfer cases minivan feels a bit faster, or more sure off the line. Feels like the minivan shed about 100 pounds, as the old oil was like an anchor working more like sludge.
D**.
Gear lube for Toyota.
Replacement fluid for my Toyota. CThis weight and spec is hard to find. Couldn't get the OE stuff and this is way more affordable.
J**A
Quality very good.
Very fast and furious quality thank my friend.
L**E
Works
Hasnโt destroyed the car so far so I guess it works well!
J**N
Rear diff oil
I chose red line as it has the friction modifier already added which was perfect for my Mk3 focus rs. Great product Great delivery time. Very Happy ๐๐ป๐๐คช
M**B
Super
it is the correct product with all the amazing quality for my Jeep 2017 Grand Cherokee Laredo differential
T**S
Very Happy
I used this gear oil for the transfer case and the rear differential fluid changes on a 2024 Toyota Rav4 Trail, Gas Version. This GL-5 version was significantly more cost efficient then the oem Toyota gear oil and more readily available. I'm very happy with this product from Red Line! I will buy it again when needed! Confirm your version of Vehicle before purchasing as some require gear oil while others require ATF. Gas version versus Hybrid version.
C**O
Best!
The Best For Me!
A**N
Great for Mazda.
Perfect for Mazda CX5. Since gear oil is sulphur based. The scent made me nauseous so be warned.
Trustpilot
3 weeks ago
2 days ago