P500 Mobile 1 75w140 syn gear oil

[jak9922]

FINALLY got around to changing the dif fluid and definitely made a huge difference in the rearend noise and thats what i was shooting for yay go me pats on the back lmao

 

[Admin]

 

[JACKAL]

FINALLY got around to changing the dif fluid and definitely made a huge difference in the rearend noise and thats what i was shooting for yay go me pats on the back lmao

Glad to hear, 75-140 hushed the noise. That is the exact viscosity I was going to try when I did my first oil change I was going to do both diffs as well.

 

[Moose308]

FINALLY got around to changing the dif fluid and definitely made a huge difference in the rearend noise and thats what i was shooting for yay go me pats on the back lmao

You get an atta boy

 

[jak9922]

Just got done with a little ride and wow i thought something was wrong cuz i didnt hear all the clancking noise lol so smooth it crazy just from a little oil change

 

[obxguy2000]

Call me dumb, but what is it about changing the dif fluid that cuts back on the noise so much? Just the viscosity being different? How hard is it to change? Is it worth changing right away or just wait to change as scheduled? Mine definitly makes a lot of noise, but since I have nothing to compare it too, I have just accepted it.

 

[jak9922]

Its a 10mm bolt on the bottom i believe a 16 on the side drain The fluid put the 10mm back in fill with fliud till it starts coming out the side 16mm? Bolt hole then plug and tighted very simple

 

[jak9922]

Syn oil = better friction reduction= ability to add heavier weight oil = less noise lol

 

[Ross1147]

Why are people going with 75-140 when the book says 80-90? Just a question that's all. I just replaced mine with royal purple 75-90. Does sound quieter on the quick trip around the block.

 

[JACKAL]

Why are people going with 75-140 when the book says 80-90? Just a question that's all. I just replaced mine with royal purple 75-90. Does sound quieter on the quick trip around the block.

The higher viscosity oil "clings" to the driveline gears better as it does not thin out as it heats up as bad. This reduces gear gnash, whine, etc. resulting is a quieter differential. If you live is a cold environment though it "can" set up dang near like gravy and be too thick thus depriving the gears of proper lubrication. In this case it would be best to jack up the SXS with tires off ground and warm it up before hitting the trials in the winter. That's why only 80-90 is recommended, it is suitable for almost all conditions but not perfect when it warms up.

 

[Moose308]

Syn oil = better friction reduction= ability to add heavier weight oil = less noise lol

1 qt. do both axles?

 

[JACKAL]

Yes 1 quart will do it. Rear is approximately 7oz. Front is approximately 21oz. Double check the capacity in your owner manual but that's pretty close.

1 qt. do both axles?

 

[Moose308]

Yes 1 quart will do it. Rear is approximately 7oz. Front is approximately 21oz. Double check the capacity in your owner manual but that's pretty close.

Thanks

 

[Tflynn]

The higher viscosity oil "clings" to the driveline gears better as it does not thin out as it heats up as bad. This reduces gear gnash, whine, etc. resulting is a quieter differential. If you live is a cold environment though it "can" set up dang near like gravy and be too thick thus depriving the gears of proper lubrication. In this case it would be best to jack up the SXS with tires off ground and warm it up before hitting the trials in the winter. That's why only 80-90 is recommended, it is suitable for almost all conditions but not perfect when it warms up.

I've been considering doing this on mine as well. How cold is too cold for the heavier weight oil? I'll probably never be in anything less than thirty degrees

 

[Moose308]

FINALLY got around to changing the dif fluid and definitely made a huge difference in the rearend noise and thats what i was shooting for yay go me pats on the back lmao

Just ordered some.Thanks.

 

[JACKAL]

I've been considering doing this on mine as well. How cold is too cold for the heavier weight oil? I'll probably never be in anything less than thirty degrees

I'm talkin 20 degrees F and below for too cold for 145 weight Gear lube.

 

[RODNUT]

I'm talkin 20 degrees F and below for too cold for 145 weight Gear lube.

Im thinking that the 75w part of 75w140 means that its viscosity is less in cold conditions than 80-90 oil. Right ?

 

[Tflynn]

I'm talkin 20 degrees F and below for too cold for 145 weight Gear lube.

I assumed that's what you meant, just wanted to be sure. Thank you @JACKAL

 

[Tflynn]

Heres a stupid question, is hypoid gear oil what we need?

 

[JACKAL]

I assumed that's what you meant, just wanted to be sure. Thank you @JACKAL

Yes you can actually purchase straight 145 and straight 250 weight viscosity gear oil (think off road racing trucks / Baja type), the multi viscosity synthetics like the 75-145 is the way to go for all conditions.

 

[JACKAL]

Heres a stupid question, is hypoid gear oil what we need?

This is what you need, pick your poison they will all be good: Lucas / Royal Purple / or Mobile 1

List: 75W-140 | O'Reilly Auto Parts