Valvoline Synpower 75w-90 Gear oil

[pjc360]

How well does the Valvoline synpower 75w-90 gear oil stack up against other synthetic gear oils? For example. How does it stack up against Amsoil severe gear or royal purple max gear or scaeffers gear oil or Mobil 1 synthetic gear oil.
I just had the bearings replaced on the rear axle on my 1991 dodge power ram 150, the axle is a Chrysler 9 1/4. I want to run a good synthetic gear oil in my both my axles.
I Bought some Valvoline synpower 75w-90 gear oil, it was on sale at my local part store for 8.50 a quart. I bought 8 quarts for 68.00 bucks.
I decided on the Valvoline synpower because I have been running Valvoline synpower engine oil and I like it, and because it was on sale and being that it was on sale it was 3 to 4 bucks cheaper a quart then all the other brands.
I decided to run the 75w-90 because I live in Idaho where it gets down to -20 sometimes and in the summer it gets up to 100. So I figured the 75w-90 would be better for my weather conditions then 75w-140. Anyways just thought I'd ask you guys how well the Valvoline synpower gear oil does and how well it compares to the other synthetic gear oils out there. Is it just as good, or better or is it not as good?

 

[skyactiv]

It works great for me. That is all I've used in the rear differential in my 07' Subaru Impreza WRX. I bought my WRX new, has 129K on it and has been modified since the 60K mark. My WRX runs mid 13 sec 1/4 miles and is on the original rear diff. I change the fluid every 30K.

 

[R80RS]

I use Synpower in the differentials on my F-150 with good results, and will use it again when it's time to change. We have the same sort of ambient temperature range here, and I've had no problems when very hot or cold. I also do a bit of towing with the truck so the oil sees some heavier loading. Sounds like you got a good deal at $8.50/qt.

Synpower 75W-90 is one of a relatively few commercially available gear oils that is also approved to MIL-PRF-2105E and API MT-1, which are additional standards for copper corrosion resistance, oxidation stability and seal compatibility.

FWIW Amsoil did a study back in 2007 comparing Severe Gear to several other synthetic and conventional gear oils. Despite not passing a foam test, the Synpower actually comes out pretty well in this comparison.

http://www.syntheticwarehouse.com/brochures/g2457_gearlube_study.pdf

 

[SOHCman]

It's good oil at a great price. In my truck I use the 75w-90 in my front diff, and the 75w-140 in my rear diff.

 

[Smoky14]

Used it in my Jeep Wrangler for years and no trouble.

Smoky

 

[Colt45ws]

Originally Posted By: R80RS
I use Synpower in the differentials on my F-150 with good results, and will use it again when it's time to change. We have the same sort of ambient temperature range here, and I've had no problems when very hot or cold. I also do a bit of towing with the truck so the oil sees some heavier loading. Sounds like you got a good deal at $8.50/qt.

Synpower 75W-90 is one of a relatively few commercially available gear oils that is also approved to MIL-PRF-2105E and API MT-1, which are additional standards for copper corrosion resistance, oxidation stability and seal compatibility.

FWIW Amsoil did a study back in 2007 comparing Severe Gear to several other synthetic and conventional gear oils. Despite not passing a foam test, the Synpower actually comes out pretty well in this comparison.

http://www.syntheticwarehouse.com/brochures/g2457_gearlube_study.pdf



It also meets SAE J2360.
http://drivelinenews.com/axle-insights/performance-beyond-api-gl-5-why-j2360-is-so-important/
It was the only one I found off the shelf that listed that spec. That is the whole reason I bought it for the CVPI.

Also, I'd pretty much ignore the Amsoil study, now. Im sure many of those have undergone changes or reformulations.

 

[pjc360]

I will stick with the Valvoline synpower gear oil. Is the 75w-90 what I need for where I live, or would I be better off running a 75w-140? Would I even notice a difference between the two?

 

[artificialist]

Originally Posted By: pjc360
I will stick with the Valvoline synpower gear oil. Is the 75w-90 what I need for where I live, or would I be better off running a 75w-140? Would I even notice a difference between the two?

You should read your owner's manual. It will tell you if an XXw75 or an XXw140 is the correct oil. I don't see any reason to use something else, unless you can find a TSB or recall notice that says to use something different from what is in the owner's manual. Sometimes the front differential needs something different from the rear differential.

Is this a 4WD truck? If so, also read what kind of fluid the transfer case uses, and change it if the fluid is old.

Anyway, I used Valvoline Synpower in my mom's Jeep Grand Cherokee when I did the first gear oil change. I used it because it was the least expensive oil that met vehicle specifications.

 

[R80RS]

Originally Posted By: artificialist
Originally Posted By: pjc360
I will stick with the Valvoline synpower gear oil. Is the 75w-90 what I need for where I live, or would I be better off running a 75w-140? Would I even notice a difference between the two?

You should read your owner's manual. It will tell you if an XXw75 or an XXw140 is the correct oil.........Sometimes the front differential needs something different from the rear differential.

Is this a 4WD truck? If so, also read what kind of fluid the transfer case uses, and change it if the fluid is old.



Yes, check the manufacturer's specification and do not deviate from that. Artificialist is also correct about possible differences in front and rear; my F-150 takes Xw140 in the rear and Xw90 in the front differential. He also makes a good point about servicing the transfer case too. They are usually much easier to drain and fill than the differential, so it makes sense to take care of it while you are under the vehicle.

 

[pjc360]

I don't have the owners manual lol this truck is 23 years old.
I know the transfer case takes Dexron atf. I have changed that fluid, I put some Valvoline dexronIII in it.

 

[Gimpquist]

I ended up needing to add friction modifier in my 98 Expedition for the posi rear diff. Never needed it with mobil 1 75w-140.

 

[Colt45ws]

Originally Posted By: Gimpquist
I ended up needing to add friction modifier in my 98 Expedition for the posi rear diff. Never needed it with mobil 1 75w-140.

My CVPI has a recently rebuilt TracLok (~1,000mi) and I didnt need any with the Synpower.

 

[Navi]

I think the most important thing is changing it in the first place. Most diffs never get changed. All the shops over here use Mobil 1 because those bottles are everywhere and readily available.