A required additive in some cars, my C3 requires it so I added it in after replacing with Amsoil gear oil 75-90, it was grinding upon turning to the left, the grinding stopped after this added lubricant.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
By 
Anonymous, 
a 
Verified Buyer 
on 
September 16, 2020
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
I will buy this product again
By 
Kelly, 
a 
Verified Buyer 
on 
September 02, 2019
Like all Amsoil products they work great that is why all my vehicles run Amsoil in them.
I had a horrible chattering in the rear end of my F150 every time I turned and accelerated. I put Amsoil slip lock in the rear diff, it took me about 2 minuets to do it and I noticed an immediate reduction in chatter. Within the first 50 miles of driving the chatter was completely gone and I have not heard it since. Excellent product and I would definitely recommend it. Probably saved me from eventually having to replace the rear end.
For the cost and better product than the dealership, I would highly recommend this.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Wonderful
By 
Hank the Tank, 
a 
Verified Buyer 
from 
Burnsville, MN 
on 
August 29, 2016
I was on a vacation up on the north shore of Minnesota. I was near amsoil in Superior, WI. I was pulling a 45' 5th wheel with my 2005 f350. Before the trip I changed the rear differential fluid to amsoil severe gear. I was having some rear end chatter. I stopped into amsoil and picked up some of this and it did the trick!
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