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Amsoil Severe Gear or Amsoil Long Life 75W-90 #4263186
12/01/16 07:30 PM
12/01/16 07:30 PM
Joined: May 2016
Posts: 11
Wisconsin
esox07 Offline OP
esox07  Offline OP
Joined: May 2016
Posts: 11
Wisconsin
I have a 2013 Chevy Silverado 1500 with the G80 Locking rear end. If I had to pick either Amsoil Severe Gear 75w90 or Amsoil Long Life 75w90 to replace my differential fluids, would I be better off with the Severe Gear or the Long Life?
I have 61,000 on the truck and replaced the factory lube at 40,000. I will be replacing the current lube at about 80,000 miles. I have a 19 foot travel trailer that I pull about a half dozen times a summer, usually under 100 miles each way. I use my truck as a daily driver and 98% of the time on the road...very little off road and then nothing extreme. I might pull a stump or two every so often. Should I go with the severe gear or long life?

Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: esox07] #4263215
12/01/16 07:47 PM
12/01/16 07:47 PM
Joined: Dec 2006
Posts: 19,139
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline
Joined: Dec 2006
Posts: 19,139
Dallas,Tx USA
I prefer Severe Gear. Looking at uoa's,I'll say that Severe Gear is probably the best gear oil you can get.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 5W20

Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: esox07] #4263221
12/01/16 07:50 PM
12/01/16 07:50 PM
Joined: Nov 2013
Posts: 873
Central Coast California
RedOakRanch Offline
RedOakRanch  Offline
Joined: Nov 2013
Posts: 873
Central Coast California
My used truck had factory fill for 80k, drained like gray molasses. Put in no name syn until 100k, it looked fine when drained. Then did the severe gear from 100k to 150k, looked brand new when drained. I vote severe gear every 50k or more.


1994 Ford Crown Vic 207k-Frankenbrew 0w20,30,40!
2005 Chevy 1500 Crewcab 4X4 180k-BC 0w30 $2/qt
2016 Outback 2.5 Limited 60k-shop brand?
Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: esox07] #4263226
12/01/16 07:53 PM
12/01/16 07:53 PM
Joined: Aug 2003
Posts: 1,142
Everett,Wa.
Stewart Fan Offline
Stewart Fan  Offline
Joined: Aug 2003
Posts: 1,142
Everett,Wa.
I have severe gear 75w-90 in my 2500hd. Simply because it was easier to get than the M1 I've used forever.

Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: esox07] #4263238
12/01/16 08:01 PM
12/01/16 08:01 PM
Joined: Sep 2010
Posts: 7,517
Texas & Global
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 7,517
Texas & Global
Long life is what trucks and industrial users run - compare builder approval list from Amsoil to Delvac 1 ...


2018 Chevy 1500 Z71 4WD
2017 Chevy Tahoe LT 4WD
2014 Fusion Hybrid Titanium
2013 Cruze LTZ - RS Turbo
Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: esox07] #4263337
12/01/16 09:39 PM
12/01/16 09:39 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
I was about to post this exact question regarding the 14 bolt in my '85 GMC. IIRC the Long Life's description suggests it's designed for use in semi trucks and the like - are the diffs in those designed such that the shear loads aren't as great as car/light truck diffs?


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: esox07] #4263351
12/01/16 09:48 PM
12/01/16 09:48 PM
Joined: Feb 2015
Posts: 773
Sask, Canada
BrianF Offline
BrianF  Offline
Joined: Feb 2015
Posts: 773
Sask, Canada
Which ever is cheaper. Either will do fine. I have the long life in my trailblazer with the G80. Yes its a smaller diff but it is a daily driver with little to no towing. Works great.


2006 Trailblazer LT. QSUD with Fram Ultra.
2017 Ram 3500 SLT Megacab. Duron SHP 10w30 with Hastings LF608.
1993 GMC 1500. QSAD with Fram PH5
Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: esox07] #4263369
12/01/16 10:06 PM
12/01/16 10:06 PM
Joined: Sep 2003
Posts: 1,338
Austin, TX
MaximaGuy Offline
MaximaGuy  Offline
Joined: Sep 2003
Posts: 1,338
Austin, TX
SV gear fluid is the way to go - the $3 between the two fluids is noise.


2018 MB GLE350
2011 Lexus ES350
2006 Toyota Highlander 4WD
Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: esox07] #4263449
12/02/16 01:03 AM
12/02/16 01:03 AM
Joined: Jun 2003
Posts: 2,772
BC, Canada
userfriendly Offline
userfriendly  Offline
Joined: Jun 2003
Posts: 2,772
BC, Canada
Eaton G80 is also in the HDs & max trailer 1500 9.76" diff. I'm switching mine, (all 3) over to 80w140.

Oronite add pack? Maybe.

www.eaton.com

www.oronite.com

Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: esox07] #4263452
12/02/16 01:14 AM
12/02/16 01:14 AM
Joined: Sep 2015
Posts: 2,478
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,478
Malaysia
Originally Posted By: esox07
If I had to pick either Amsoil Severe Gear 75w90 or Amsoil Long Life 75w90 to replace my differential fluids, would I be better off with the Severe Gear or the Long Life?

In terms of ....??

Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: userfriendly] #4264136
12/02/16 07:59 PM
12/02/16 07:59 PM
Joined: Apr 2012
Posts: 2,698
West Michigan
buck91 Offline
buck91  Offline
Joined: Apr 2012
Posts: 2,698
West Michigan
Originally Posted By: userfriendly
Eaton G80 is also in the HDs & max trailer 1500 9.76" diff. I'm switching mine, (all 3) over to 80w140.

Oronite add pack? Maybe.

www.eaton.com

www.oronite.com




All I know is that after recently installing an eaton Posi in my Ford 9.75 I have about 10oz of amsoil friction modifier on top of amsoil SG75w140. Still not buttery smooth but more wheel scrub than chatter at this point. Going to wait for slicker conditions before I decide whether I'll max out their recommended range of 4-8oz FM per 1.5qts of oil.


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Amsoil Severe Gear or Amsoil Long Life 75W-90 [Re: esox07] #4592625
12/03/17 03:02 AM
12/03/17 03:02 AM
Joined: Jul 2008
Posts: 445
London, UK
Izb Offline
Izb  Offline
Joined: Jul 2008
Posts: 445
London, UK
Is severe gear - HC-base oil, but long life - PAO-based oil?
Which 75W-90 oil is preffered for summer?


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