I Hate Amspoil Moly Syn Grease

[landtoy80]

venting: I HATE AMSPIOL MOLY GREASE.
Its way to thick.
My last birfield repack I used amsoil moly grease. I thought it was kinda thick but thought it would be ok. NOT.
WHen I slid in the newnewernewfield it must of pushed the THICK GREASE past the seal.
I changed the gear oil a couple times and that cleared thing up. I put a couple pumps of grease in the fill hole (the part of the bell that the wiper goes over was dry) the other day and when I went to change the oil, it was GREEN.
The bell is still dry but there is grease in the oil again. Not sure if the grease got in over the winter or if it got in when I pumped a couple pumps of grease in a couple weeks ago.
My breather is not plugged as I have a filter on it so it can breath. ANd I know its not overfilled as the bell doesn't have fresh grease in it.
I assume the spring is still on the oil seal as there is no gear oil leaking out the knuckle.
It must be that when the oil is cool, its thick enough to push past the seal when the steering wheel is turned.

The oil is just green from the grease so I don't think its full of grease like someone posted.

How hard is it on the diff having grease in the oil? I think it just makes the oil a little thicker.

 

[Junk]

You should have changed your VSV

 

[concretejungle]

Maybe you put too much in knucklehead.

 

[landtoy80]

I put the same as I did the when I used Citgo grease.
I am sure its the thickness of the grease. Citgo is like soft serve icecream.
Amsoil is like handdip icecream.
My other anal-ogy is like what happens after you eat TacoBell and eating tooo much cheese

 

[robbie]

In my opinon the grease is only slight mix and should not hurt anything as long as it does not get extra thick and stops lubing in low temps. Later robbie

 

[landtoy80]

The oil was just a little thicker than normal gear oil.
I was hopping to go one year without doing a birfield job but thats not going to happen as now I am going to pull it apart and put in a non-syn grease.
I think my luck wasn't going to last this year anyways. The newnewernewfields are starting to ring the bell again.
THey sure don't last long do they?!!!

 

[Rich]

What is worth giving consideration is that grease mixed in with the gear oil the can result in the gear oil foaming. Execessive foaming can impair proper lubrication.

Here is an exercise. Drive the truck for a good distance on the highway. Go home and remove the front and rear diff filler plugs. Shine a small flashlight in the filler opening and compare how much foam you see in the front diff compared to the rear.

 

[landtank]

I used valsynth moly grease on 3 axles now without issue. It was a little thinker than dino but no where near the cheese bind end of the spectrum.

 

[Klunky Chris]

no problems with my Amsoil birf repack
gear oil is fine

 

[IdahoDoug]

Kurt,

I can't see how you can "blame" the Amsoil for whatever's going on with your diff oil. First, the Amsoil Moly is purple and I cannot see how its presence would turn the diff oil green? Second, turning does not create any pressure within the knuckle to "force" grease into the front diff housing - it simply swivels but does not change the interior volume of the knuckle.

I am still getting old grease in my front diff from over 30,000 miles of driving, so I think that's your problem - old grease in your front diff housing. On one of my earlier post repack front diff oil changes it looked clear. The next one it was cloudy again. I chalked the clear change up to a period of driving when it was colder and I had not been on the freeway or other condition to cause it to heat up enough to continue dislodging/dissolving the old grease.

DougM

 

[concretejungle]

Now that i think about it, if the diff oil is green i bet it's a little left-over grease from the first change. That's what happened in mine, i had a little green grease in there from the PO. When i repacked with Amsoil two drains and it was clear.

 

[landtoy80]

I checked the oil that I drained out and its greenish with purple streaks in it.
I had green oil from the t-case but thats from the green paint the gears.

I mixed some grease and gear oil and it turns brown, not purple or green.
Anyhow, there is Amsoil grease in the oil so it must be fresh as its still purple and has not disolved in the oil yet.
I do find it strange that grease can get in the diff but oil won't leak out.

 

[IdahoDoug]

Kurt,

I do not believe the Amsoil is to blame here at all, even though you have now found purplish streaks in your oil as well. You mention you think the Amsoil is 'too thick', and you feel this thickness is to blame for grease getting 'pushed past' the inner axle seal. Um, thinner grease would go past the inner axle seal MORE easily, so this contention doesn't pass the logic test. Ditto your contention that the Amsoil recently got by the inner axle seal because you put a couple pumps in - thinner grease would have more easily gotten by the seal.

So, I don't know what it is you have against Amsoil, but this is unwarranted criticism.

One comment/question I do have is about your breather. Did you actually replace the entire breather tube right at the axle with fresh tubing, or simply put a filter atop the old one? Also, even the fresh tube can get reclogged if you had a lot of old grease from the original contamination, so don't rule that out - it's a simple matter to pull it off and run solvent through.

Another comment I have is that I've seen slight grooving in some axles where the seal runs, which means that subsequent new seals and repacks aren't going to last as long because seal pressure is dramatically reduced even when new. So you may simply be the first to experience or note this expected effect.

No affiliation on the Amsoil.

DougM

 

[landtoy80]

When I put the birfield in the axle tube, I put some grease behind the birf and then pushed it in.
The thick grease didn't gooze out like the Citgo grease did and the seal must of the weakist link and grease got in the axle housing.
I have 258,000 miles on the inner axles so in my knuckle the seals could be the weakist link. On yours, the seal might not be the weakist link.
I flushed the grease out by changing the diff oil a couple times. Once it was clear it stayed clear.

There is a grove on the inner axle but its not too bad as it doesn't leak oil.

I just blew in the breather and there was no restriction.
And even if the breather was plugged, it would blow oil out past the seal when it got hot like it did on the rear diff and blow oil into the rear wheel bearings.

I still don't know how the oil turned green. My sample is still brown. Maybe its needs to be cooked and spun to make the turn

 

[landtoy80]

Even Amsoil admits the HD Syn moly grease is HARD. ;p
It says on the tube:
"Also available: Softer consistency Heavy Duty NLGI #1, AMSOIL Multi-Purpose , and special application water resistant and racing grease."

 

[semlin]

kurt

any chance that after 258,000 miles you have one of those nasty ridges worn in one of your inner axles where the inner seal meets the axle? I don't doubt the amsoil is thick but i can't see how that could help it penetrate a healthy seal/axle joint. i would think the amsoil is helping if you have a leaky seal. I recommend you continue to use it