FlexFill Advanced Full Synthetic Full Synthetic 75W-90 Gear Oil 1 QT FlexFill

Valvoline FlexFill Extended Protection Full Synthetic 75W‑90 Gear Oil is one of those products that makes a messy job way easier. The FlexFill design is incredibly convenient—you can reach tight spots without fighting a rigid bottle or making a huge mess. The flow is controlled, the packaging is smart, and it saves a ton of frustration. For my Ram 2500, Performance‑wise, the oil itself is top‑notch. Smooth operation, great protection, and the peace of mind that comes with a trusted synthetic formula. Between the quality and the convenience, this is an easy five stars

Perfect, used as a maintenance item on a 2019 Ram Rebel as the differential fluid on the truck needed limited slip additive. So far the fluid is doing its job with no leaks. I love how easy it is to fill the differential with the baggy design for the product, brilliant! Great value for the money!

Valvoline is great rear-end fluid for my Ford 8.8. Added during a recent fluid and differential cover change. WIth the limited slip additive and Flexfill gear oil, my differential hooks up much better and is definitely smooth as butter. The gear oil bags/packaging are very useful but I still used a hand pump/hose to add back the new oil to the differential. Highly recommended for the health of your differential!

These Valvoline lube packs made refilling my differential clean and easy. My Ford excursion had over 220,000 miles and it was time to change the differential fluid along with transmission fluid and oil and transfer case fluid. After this lubrication service I was pleased to receive a 15% boost in fuel economy above the normal 10 and a half miles per gallon I had been getting.

The bottle design saved me from having to buy a small hand pump for my transfer case. Overall the fluid is synthetic and at a reasonable price point so it’s a good fluid to use. Of course if you’ve never used gear oil before the smell is normal due to limited slip additives.

Easier to use than a pump for differential fluid changes.

I use this vs a vehicle manufacturers branded gear oil. Why, just as good or better and saves me a few bucks at the same time. Is the "extended protection" version better than regular Valvoline full synthetic gear oil and worth the higher price? In my case, I think it could be overkill for something that I will change yearly, but it's a "feel good" for me. Being in a bag vs the quart plastic bottle may be more of a pain in my particular application.

2021 Jeep Wrangler Sahara Altitude. Works great and the differential is extremely quiet. This is the stickiest gear oil I have ever used including marine gear oil. No doubt your gears will have extra protection. I will without a doubt use Valvoline Extended Protection exclusively here on out on every vehicle.