57904 75W90 GL-5 Synthetic Gear Oil for Hypoid Limited Slip Differentials - 1 Quart (2 Pack)

You probably already know that Red Line gear oils are great. Red Line is slippery and stays stable and slippery under high heat and high shear conditions. Thats exactly why I use their 75w90 gl-5 to keep my son’s 2006 BMW driving like new. I tried to get 2 bottles from my local O’rielys but they didn’t have any in stock so I checked Amazon and found this 2 quart pack for about $10 less than the local store price. I was even able to get it delivered between 7-11am the next day which really helped me get everything done on the day I was planning for. Great project, excellent price, extra fast delivery, great experience and a very good seller.

The rear diff on my '07 Tacoma Sport was so rough I thought it was toast. I changed the oil with this Redline 75W90 GL-5 and it works sooo much smoother. I'm guessing the previous owners filled the diff with regular gear oil without any limited slip additive. With this Redline gear oil it runs smooth as silk... like I have a new diff! No special additives needed. I'm so happy I went with this product. I bought 4 quarts and used just over 3 to fill it. The only issue I had was the bottle opening is not a standard size... slightly smaller than a normal quart opening. It will work with quart hand pumps (SP) though, just be careful to hold the pump in place on the bottle and not spill any. I plan on using this same oil in the transfer case and front diff as well. You will need a 6$ crush washer kit for all the drain/fill plugs. Includes both diffs & T-case.

This is excellent gear oil. Been using it for years.

If you are aren't familiar with Red Line automotive lubricant products -- be informed that most knowledgeable mechanics consider it to be the best line of petroleum products available. My cars are all currently FWD, but I have a long history of ownership and maintenance on 4-speed manual transmissions and RWD differential units. Presently, I use this gear oil in the differential of my Yamaha shaft drive motorcycle. My recent experience . . . The original Yamaha factory gear oil had been changed to Valvoline Synthetic at a few thousand miles. At about 16,000 miles on the odometer, I had noticed a little bit of audible gear while decreasing speed down to a stop. I figured it was time for a gear oil change and this time installed the Red Line 75W90 Synthetic Gear Oil. The whine immediately disappeared. Would it have disappeared if I had used any other oil? Probably. Or maybe not. Either way, I really like knowing I have the best lubricant available in the gear unit. I'll should also mention. This stuff is super slick, and claims to reduce heat dramatically and increase efficiency (gas mileage) a few percent (we'll see). It's so slick that the manufacturer suggests that for limited slip applications, a limited-slip additive is probably not needed to eliminate chatter (I recall in years installing a rebuilt Chrysler 8 3/4 posi unit and had to do exactly that -- put in an additive to prevent chatter -- so Redline is claiming I possibly wouldn't have had to do that using their lube -- an interesting claim). UPDATE: After putting about 6,00 miles on this Redline in the differential (motorcycle), I've "touch-tested" regularly, and can report with confidence that this stuff absolutely reduces operating temps. A lot. Even after extended high speed/summer temperature use, the differential temp never got much past "warm to the touch". With the original Yamaha gear oil, it got HOT. This is great stuff.

Works well so far in a rear differential for a c6 corvette. Place in a warm bath before pumping to move fluid easier.

Delivered in proper time, will be first time using this product for a differential, I have heard great reviews and product quality for the RedLine 75w90 use on Mercedes Benz.

I used this on a 2024 Nissan Frontier with an open (DANA) rear differential. This differential fluid has an ester/pao base with a very robust additive package. It has a more viscous consistency and provides more of a "cushion" for the gears and bearings inside a differential. The fluid itself has a slightly red appearance and you can actually smell the esters in the fluid. Redline does a really good job with their formulations and base oils.

If you own an older car with a limited slip rear end this is the perfect oil for it.

Mejor aceite para mi diferencial

Little pricy but good stuff. Oem oil weight grade

Red Line Gear Oil consistently delivers superior performance under high-stress operating conditions, making it an optimal choice for both professional and enthusiast-grade mechanical applications. Engineered with advanced synthetic formulations, this product offers exceptional thermal stability, shear resistance, and long-term protection across a wide range of gear systems. In real-world application, the oil has demonstrably improved drivetrain smoothness, reduced operating noise, and contributed to extended service intervals—resulting in reduced downtime and maintenance overhead. Its performance in high-load and high-temperature scenarios reinforces its reputation as a category leader in gear lubrication.

デフ特有のガリガリ音も少なく効きもとてもいい感じです。 夏場やサーキット走行するにはもっと固めのでもいいかもしれませんが街乗りではとても十分です！

Great lubricant, lasted in the car for several years.