What synthetic gear lube do you use in your rear diff?

[klenger]

I'm installing a Mag-Hytec and synthetic gear lube for towing our new 5er, and was wondering which lube to use. I'm so confused, and thought a poll might help. Any additional comments are apprecieated.

 

[Cooker]

Right now it's Mobil One. I will change it when I get around to it to a 75w140. I'm not sure of the brand that I will go with, maybe Amsoil.



-Ryan

 

[John Berger]

If you are going to be towing that 5'er, I would go with a 75W-140, regardless of the brand name that you choose. Your owner's manual recommends that weight for towing.

 

[DAWG-1]

Royal Purple

I use Royal Purple 75-140 with no friction modifier .

 

[Mactruck]

Amsoil 75w - 90

 

[Dane]

Lubrication Engineers of course Recommended by Roy at Mag-Hytec.

 

[Texas Diesel]

The factory recommends 90-140 synthetic for towing. That is assuming you have a factory cover. With the Maghytec I noted the even with dino 90w my towing temp never exceeded 180F. So when I switched to synthetic I installed Mobil1 75-90. My temps pulling 12,000 in 100F are still right at 190F. My worry was that in the winter the 140 would be too thinck especially with the increased capacity of the Maghytec. Once upon a time when I lived in AZ I put 140W in both axles of my truck (dakota) and after a trip to Texas in January ( avg temp 50-19F) I got home with leaking axle seals on the front axle. Upon inspection the 140W destroyed the seals because ( IMO ) it didnt flow and was way too thick. The front axle was not doing any work and there was no lubricant heating. You could see a severe build up of burned lubricant under the seals. This may not happen to the rear because it is always working. Just my thoughts and experience. Perhaps others have sucessfully run 90-140 in the winter with no problems. BTW I have no friction modifier and my "sure-loc" sure doesnt lock!!!

 

[claymike]

L. E. 607

 

[C Schomer]

I used 2k75w90 for 13,400 and developed ring and pinion noise. Have had RP Maxgear for about 5k now and noise is gone. Plan on trying RP 85w140 next time.

 

[klenger]

RP? Please explain.

 

[larryq]

Lubrication Engineers... Roy at Mag-Hytec... a Man... Who knows his Stuff!!!!!

 

[Sled Puller]

You guys are killin me!LOL~!!!!





Amsoil Series 2000 75w-140





Gene, A Man Who Can Read!

 

[Cooker]

ROTFLMAO @ MGM



Just because you can read doesn't mean you are smarter



-Ryan

 

[JohnB]

Red Line 80W-140

 

[Archive]

Amsoil 75-140.

 

[C Schomer]

Klenger, I have the RP Maxgear 75w90 and will switch to the 85w140 next time. My noise went away so I,m not too worried right now.

 

[EMDDIESEL]

I am going to use Valvoline Synthetic or Amsoil when i do mine this week. Still not decided on what weight though.

 

[Alan Reagan]

Valvoline Synthetic 75W-90. LSD works like it should with no additive.

 

[redram]

Royal Purple

RP MaxGear 85W140 for 130K in a 96 3500 5 speed

No need for the expense of a bigger diff cover!

 

[Jay]

Royal Purple MaxGear 75w90... no friction modifier