Exxon patent for improved ATF fluid.

[friendly_jacek]

I found this patent from 1997 while doing some google searches:
Exxon patent link

results are great:
reduction in copper

acid number reduction


Only by adding just 10% of heavy PAO such as PAO-100 (I checked, available by train tankers).

I wonder if Exxon or any petro company is doing this. Could Dex VI be based on this principle? Maybe Amsoil, Redline? I guess it's a trade secret.

 

[jorton]

Some Mercron V is synthetic blend. Could it be the Exxon ATF? And there are "universal" synthetic blend ATF. How about those?

 

[SteveD2]

I keep reading about copper reduction being a great thing. Where's this copper coming from?

 

[d00df00d]

Clutch packs I think.

 

[mechtech2]

I never saw a clutch pack with copper.brass/bronze.
Must be in the bushings somewhere.

 

[Whimsey]

Originally Posted By: mechtech2
I never saw a clutch pack with copper.brass/bronze.
Must be in the bushings somewhere.


Transmission cooler maybe?

Whimsey

 

[MolaKule]

Yes, copper fluid cooler (heat exchanger).

Quote:
The compositions of this invention will contain a minor amount of the high viscosity polyalphaolefin. Typically, amounts range from 1 to 25, preferably from 2 to 20, most preferably 5 to 15 weight percent in the finished fluid.


This was one of many Exxon patents relating to shear stability of various lubricants.

EM found (or simply rediscovered) that using a small percentage of high viscosity PAO's (greater than 40 cSt, and a correspondingly high percentage of low viscosity PAO's) would result in shear stable fluid for PCMO's and transmission fluids.

This is similar to putting petroleum Brightstocks into oils to thicken them and to increase shear stability.

IMHO, the only reason

 

[MolaKule]

The editor timed out on me...

IMHO, the only reason they recevied the patent was because they were using high viscosity PAO's instead of Brightstock.

This was no real revelation in terms of blending.

 

[friendly_jacek]

Originally Posted By: MolaKule
The editor timed out on me...

IMHO, the only reason they recevied the patent was because they were using high viscosity PAO's instead of Brightstock.

This was no real revelation in terms of blending.



How about the claims on lower wear, better shifts, acid number, etc. Sounds substantial for only 10% PAO. This would support the common belief that synth blends (gr III/IV aka Castrol, Mobil 1, etc) as almost as good (or better if carefully formulated) as the real thing.