#1.Mobil 1 75W-90 Synthetic Gear Lube
For those looking for the best 75w90 gear oil, we highly suggest that you try out the Mobil 1 75W-90 Synthetic gear lube. There’s a full laundry list of benefits to your gears, engine, and overall vehicle in the short and long term that we just aren’t going to get into now. You just need to know that it works better than advertised and it works better than other brands. Mobil 1 is also quite a reliable trusted brand in this industry.
Best 75w90 Gear Oil
- #1.Mobil 1 75W-90 Synthetic Gear Lube
- #2.Lucas Oil 75W-90 Synthetic Gear Oil
- #3.Red Line 75W90 GL-4 Gear Oil
- #4.Valvoline 75W-90 Gear Oil
- #5.Royal Purple 75W90 Gear Oil
#1.Mobil 1 75W-90 Synthetic Gear Lube
If you are looking for the best 75w90 gear oil, we highly recommend you try out the Mobil 1 Synthetic Gear Lube. This gear oil has exceptional thermal stability and can withstand high temperature oxidation. And since it gives you a longer seal life as well as an extended bearing and gear life, it also greatly extends your oil drain and service intervals. Additionally, it gives you outstanding protection at low speeds.
We can go on and on about the benefits. You also get great shear stability and excellent rust and corrosion protection. There’s also reduced wear of your gears and components. Yes sure we admit, most of the other 75w90 gear oils do the same thing, but there’s no other brand that does all of these better than the Mobil 1 for the same price.
#2.Lucas Oil 75W-90 Synthetic Gear Oil
Next up, we have the Lucas Oil 75W-90 Synthetic Gear Oil, which is the best 75w90 gear oil for those who want something heavy duty with high performance and stands up to high temperatures. This synthetic gear oil is made by Lucas, which has been a major player in this industry for a long time and definitely has a very reliable manufacturing and quality control process.
This is a non-foaming super slick long lasting lubricant that is absolutely great for both heavy duty and high performance activities. Other conventional gear lube simply break down in extreme heat. While we don’t think that the Lucas beats the Mobil 1 in terms of heat sensitivity, it certainly holds a close second. And we like that it contains a special additive that cushions gears and doesn’t lose lubricity.
#3.Red Line 75W90 GL-4 Gear Oil
Another really good product when it comes to the best 75w90 gear oil is the Red Line MT-90 GL-4 gear oil. This gear oil does a great job of eliminating bad shifting in the cold. So the standout feature is that it just gives you way smoother shifting than most of the other brands we have tried. It basically offers quicker shifts and a perfect synchronizer coefficient of friction.
Additionally, it gives you a high performance gear protection and a much longer syncho life, which are quite important things that many people care about. While it is not on par with the previous two brands in terms of holding lubricity in extreme heat, it is good enough in our opinion. The star of the show is still efficient gear shifting.
#4.Valvoline 75W-90 Gear Oil
The Valvoline 75W-90 Gear Oil is another great brand that deserve a bit of a mention. This is a great gear oil with ratings that are above most vehicle requirements. Valvoline is a welll trusted player in this competitive industry and certainly makes great auto accessories and performance oils. We consider their 75W-90 gear oil one of their top products.
Overall, we think that the durability is absolutely excellent and it holds its lubricity pretty well in extreme temperatures and in particular very hot temperatures. We say that it is right behind Lucas and Mobil 1 when it comes to lubricity. The trade off is that this offers better shifting overall and is quite smooth even on idle.
#5.Royal Purple 75W90 Gear Oil
Lastly, we have he Royal Purple 75W90 Gear Oil, which is absolutely great in our opinion if you are looking into preventing rust and corrosion in your gears. While it does have the standard set of features that pretty much any 75W90 gear oil has, we think that the star of the show is definitely its superior ability to prevent corrosion.
Additionally, it has a lower coefficient of friction and is compatible with other oils. it also gives you excellent water separation and just generally good wear protection. And finally, we think that it does a pretty good job of making your gears run smoother and more quiet than most other brands on the market.