best synthetic gear oil??

[buster]

Amsoil

 

[daman]

Quote:

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I`ve got Mobil 1 75W140 in my Z.

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^

 

[XPR]

Amsoil. Go read the white paper they just did.

 

[harry j]

Go with Amsoil.

 

[SkyPup]

Why does Mobil 1 want almost twice the money for their 75W-140 as opposed to their 75W-90? I just changed today to Royal Purple 75w-140, same price as their 75w-90 or Mobil 1 75w-90.... I just couldn't see why I should spend an extra $26 to use Mobile 1 75w-140.

 

[aquariuscsm]

Quote:

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Why does Mobil 1 want almost twice the money for their 75W-140 as opposed to their 75W-90? I just changed today to Royal Purple 75w-140, same price as their 75w-90 or Mobil 1 75w-90.... I just couldn't see why I should spend an extra $26 to use Mobile 1 75w-140.

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I was wondering the same thing. What`s the deal with the 75W140 being $15,while the 75W90 is $9?

 

[JohnBrowning]

Redline all the way!!! Schaffer's and Cen-Peco for dino and semi-synthetic.

 

[gregmp]

75w-90 sells in large quantities. 75w-140 does not.

Volume discount I would think.

 

[D-Roc]

Royal Purple or Chevron for me...

 

[mikeg5]

why do you guys run a 75-140 in something that calls for a 75-90? just curious? thanks guys

 

[unDummy]

Thick oil protects.

 

[MaximaGuy]

unDummy: Can we run 75W110 when the vehicle is speced for 80W90, though I would rarely tow my highlander?

 

[unDummy]

Yep, 110wt is a new spec. Various 90wts were in the 110wt range years ago.

Definitely use the 75w110 as an upgrade.

 

[nascarnation]

Reading the Amsoil "white paper" (further down this section of the forum) convinced me that Mobil 1 was the best value.

 

[buster]

Quote:

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Reading the Amsoil "white paper" (further down this section of the forum) convinced me that Mobil 1 was the best value.

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I find it funny how M1 gets bashed so often, yet on every test Amsoil does, it's always #2 and in some cases #1. Tells me that most people don't know what the heck they are talking about.

 

[artificialist]

I used Valvoline 75w140 in my mom's 2005 Jeep Grand Cherokee, and it worked as well as the factory fill. Later I changed it out with Royal Purple Max Gear 75w140, and I couldn't feel any difference. Valvoline and Royal Purple gear oils contained limited slip additives already, so that is why I used them in mom's SUV.

 

[jonny-b]

In both Automatic and Manual transmissions, I have been using Shell, Mobil1 and Royal Purple. I found that RP was the best of them. Then I tried something that totally changed everything I thought I knew, about shift-quality and smooth operation: I filled the transmissions with Synlube. I am never going to use anything else. Before I did this, I had been driving at least 1 million miles(1609000km), and if someone had told me back then, that the differences in shift-quality were so big, I would just have been laughing. It just annoys me that I didn't try this before.

 

[val]

2007 titan---spec syn 75W140 rear differential

 

[mazduh30]

I use and believe in Amsoil.

 

[hooperswish1]

Rp for me. I had 75w140 for the rear, and 75w90 for the front of my jeep liberty. I did the front first, and unfortunately put the 75w140 in the front w/ my first quart (too excited...dum dum). Therefore, both the front and rear diffs have a mix of the thin and thick stuff. Seems to work great, but winter is still on its way...