#1.Lucas 75w140 Synthetic Gear Oil
If you want the best 75w140 synthetic gear oil, we strongly urge you to try out the Lucas 75w140. This synthetic gear oil really does a great job in standing up to extreme temeratures and won’t lose its lubricity while other brands tend to break down. It lasts a long time, is good value, and Lucas is definitely a reliable brand in this industry.
Best 75w140 Synthetic Gear Oil
- #1.Lucas 75w140 Synthetic Gear Oil
- #2.Royal Purple 75W140 Synthetic Gear
- #3.Mobil 1 75W-140 Synthetic Gear Lube
- #4.Valvoline 75W-140 Synthetic Gear Oil
- #5.Red Line 75W140 Synthetic Gear Oil
#1.Lucas 75w140 Synthetic Gear Oil
For those who are looking for the best 75w140 synthetic gear oil, we highly recommend that you try out the Lucas 75w140. This is a super slick long lasting lubricant that can withstand very high temperatures. So we think the standout feature of this synthetic gear oil is that it is still able to maintain its lubricity despite being in extremely high temperatures. Other brand tend to break down in high temperatures.
With the Lucas, you also get way less gear noise and a longer bearing life than regular lubricants. We find that they also work really well in limited slip differentials. And finally, we should mentioned that the Lucas gear oil work will typically outlast most other brands out there. It is a very reliable brand and has been around the industry for a very long time.
#2.Royal Purple 75W140 Synthetic Gear
Next up, we have the Royal Purple, which is the best 75w140 synthetic gear oil for those who a solid performing gear oil with friction modifier additive. The result is a great synthetic gear oil that has superior corrosion protection and outperform most convention oil as well as other brands of synthetic gear oil.
Additionally, we really like the Royal Purple because it just runs a lot more smooth on idle and the smoothness is even more noticeable when shifting gears and accelerating hard. Overall, we think that it does a fantastic job of extending gear and bearing life and lowers the coefficient of friction. There’s no real math backing it up, so we base it off of word of mouth reviews.
#3.Mobil 1 75W-140 Synthetic Gear Lube
Another really nice option when it comes to the best 75w140 synthetic gear oil is the Mobil 1 75W-140. It does a great job of reducing chatter and improving traction as well as reducing wear at startup. Compared to other brands, we think that the Mobil 1 does an exceptionally better job over a wider range of temperatures. It has this SuperSyn anti-wear system which optimizes viscosity-temperature properties.
Furthermore, it is nice to know that this gear lube protects against oxidative and therma degradation, corrosion, wear and tear and viscosity loss associated with premature shearing. All in all, we just love this gear oil because it gives you amazingly fluid viscosity at both low and high temperature ranges, which is something other brands can’t replicate.
#4.Valvoline 75W-140 Synthetic Gear Oil
The Valvoline 75W-140 is another great synthetic gear oil that is reasonably priced and comes from a very reputable brand that consistently deliver great results. We think that this brand offers a pretty good combination of durabiltiy, performance, and price. It is basically the jack of all trades and the master of none. In other words, we find it “well rounded.”
In terms of overall durability and how long it can last, we find it somewhere in between the brands that we mentioned above. And it does a pretty good job of preventing wear and tear in your gears. This in turns greatly helps extend out gear and bearing life. While we can’t say that it is the best here, what we can say is that it gets the job done well.
#5.Red Line 75W140 Synthetic Gear Oil
Lastly, we have the Red Line 75W140 Synthetic Gear Oil, which also contains additional friction modifiers for suitability with clutch-type limited slip differentials. So this also means that no additional friction modifiers are required. Please just note that this gear oil is not made for most manual transmissions or transaxles, which can lead to shifting problems.
Overall, we would say that this lubricant provides a pretty constant viscosity and film thickness and can withstand a wide temperature range. It is not as good here as the Mobil 1 mentioned above. But most people probably won’t even be able to tell the difference and don’t care. We just know that the Red Line definitely provides a high degree of protection and improvement of differential