Amsoil Fails To Perform!!!

[Gene-C]

I had a shudder from what turn out to be the limited slip rear end. I changed the rear end lube to Amsoil series 2000 75W-90 as per recomendation from their tec advisor. They advertise that no aftermarket additive is needed.

The shudder continued so I added one bottle of Mopar additive. BINGO! No more shudder. Very disappointed that amsoil didn't live up to their reputation and the advice I recieved directly from their tec advisor.

 

[HoleshotHolset]

I wouldn't trust a tech advisor as far as I could throw him/her. In customer service you are often met with someone who would rather be at home watching football and drinking beer than be at work (that never happens... )... . so when you call with what they may consider to be a 'petty' question, they may just tell you one thing or another just to get you off the line. Sad, but true.

FWIW, the Mopar additive is what I've used in F*rd rear axles with good luck.



Matt

 

[Dennis Garrett]

Same with mine, I've used the Amsoil in the rear end for 4 years now, changed it twice, each time I have to add a 1-1/2 bottles of that Mopar smelly stuff. After that, it's fine, Stays nice & clean too.

 

[HoleshotHolset]

Smelly is good... . that's the kind you want especially in an LSD rear axle. Good 'ole hypoid.



Matt

 

[Sled Puller]

Did you do several tight figure 8's after the change?



I have had guys call with the same problem, a few tight 8's and it is fixed.



Gene

 

[HoleshotHolset]

Imagine this situation: F*rd E-350 DRW type III ambulance doing figure-8's in the company parking lot at 8pm after I finished rebuilding the rear end when it ate itself... . the EMT's/'medics were so perplexed as to what was going on that they called me on the 2-way and asked... .

I even soaked the friction plates in the Mopar modifier for 4 hours prior to installation... . so far... so good.



Matt

 

[drawson]

I have run AmsOil seri 2000 75W/90 for the 50K and have never added any LSD additive but almost did before I found a church parting lot and did some tight figure 8s(ok my truck doesn't turn tight)

 

[Don M]

Well, I even got this to work. Try the figure 8's and if it does not work. I will rib MGM until the cows come home or in his case, the sheep.



Don~

 

[SlyBones]

I recently switched to amsoil 75w-90 and had found I need to add some also. In the responses I got to my thread, one person stated that a rear end expert from DC says we need 6-8 percent additive. With a standard pan and plain gear lube that works out to be 7-9 oz. or basically the recommended 2 bottles.



Part of the thread said Amsoil is supposed to be about 5% additive. So with my standard pan 3oz of mopar additive brings it up to 8% additive. Now it works great.



The recommended procedure was to do the figure 8's, then add 2oz at a time until shutter is done at low speed, low power. -- I was lead to believe that heavy throttle in a tight turn should produce some shutter, as this is the LSD doing its thing. -- its a fine balance between enough lubrication to provide smooth corners and enough friction to give good traction when the situation occurs.

 

[Skydiver]

$.02

I changed my rear-end dope the last weekend in July with coastal synthetic and put 1 bottle of whatever Advanced auto sells. Next morning I drove 360 miles to gnashville Tennessee without doing the figure 8's. Not 1 chatter and rearend is much quieter now. Went to meet Mr. and Mrs. Swamp Rat. I must say they are Very fine mountain folks.

Tim

 

[Timinator]

Thanks for the information without the emotion, Slybones. Your kind of comments are what this site needs more of.

Gene, every differential is different. Some may need the additive. Some might not. If a manufacturer made a gear lube for the LSD differential that requires the MOST additive, then it would cause other LSD differentials to act as an open diff. You can't take out additive once you put it in!

 

[fest3er]

Originally posted by Timinator

... Your kind of comments are what this site needs more of.

Gene, every differential is different ...

Granted, Gene could be a little more ... politic at times, but he is right. After changing the lube, one should drive in a number of figure eights to work the new fluid into the clutches.



Also, yes, every rear end is different. The preload(?) is different for every axle. Some are tighter, and some are looser, and some are about right. The tighter ones may need some friction modifier, whilst the axles that are about right likely won't need any at all. It's the axles that are on the loose side of the settings that slip more than is desired.



When I switched to Series 2K, I drove in tight circles, left and right, in the cul-de-sac on my street. I haven't had any indication of the axle being too tight or too loose. Used to be, back in IL, there would be just a little chirping on left turns.



Fest3er

 

[BillGotthelf]

I changed my rear end cover and fluid at the same time. I used Castrol synthetic 75-90 with no additive as the Castrol said it was not needed. 3 years later and 45,000 mile no problem and I have never seen temps higher than 195.

 

[Gene-C]

Thanks for all that replied. After changing the rear end lube to Amsoil I drove to work for several days and also did the figure eight thing to no avail. When I added the friction additive and did the figure eight thing again all is ok. Maybe Amsoil should say that some rearends may need the additive instead of saying flatly that it is not needed.