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Looking at 75w90's #4782892
06/10/18 09:30 AM
06/10/18 09:30 AM
Joined: Apr 2012
Posts: 2,630
West Michigan
buck91 Offline OP
buck91  Offline OP
Joined: Apr 2012
Posts: 2,630
West Michigan
Going to work on doing my 100k service on the F150 this summer and one of the jobs is the front dif. I'm sure its in just as bad of need as the transfer case was. Spec is 80w90, I think I'll go with the 75w90 synthetic alternative but I'm a little torn on which one to get. Motorcraft and Amsoil run about the same price but I can save some money going with SynPower or M1 which are also about the same price as eachother and a couple bucks less per quart than Amsoil.

In the past I've had no troubles with Synpower. I did have some wheel bearing issues on my Mustang after switching to M1 which I cannot rightly explain as levels were fine and mileage wasn't too excessive at that time. Is there any real difference between the two? I have to imagine both are using grp III+ these days, and both seem highly reputed. Truck seems most 4WD action in the cold of winter so I do think the 75w will be a slight advantage.


Addendum: Looks like M1 is very slightly less impressive on paper.
SynPower:
VI: 150
PP: -48C
Vis 100C: 15.6
Vis 40C: 100

M1:
VI: 146
PP: -39C
Vis 100C: 14.6
Vis 40C: 103

I know numbers are FAR from the whole story but it seems the SynPower is marginally superior?

Last edited by buck91; 06/10/18 09:38 AM.

2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Looking at 75w90's [Re: buck91] #4782900
06/10/18 09:40 AM
06/10/18 09:40 AM
Joined: Jul 2005
Posts: 30,603
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,603
NY
I went with Mobil 1. Pep Boys has coupons from time to time offering 25% off and I loaded up on it then. Both my Jeeps have it in them, and I've used it in several other vehicles over the years. I never had a problem with it.


God Bless Our Troops

Re: Looking at 75w90's [Re: buck91] #4782911
06/10/18 09:51 AM
06/10/18 09:51 AM
Joined: Sep 2015
Posts: 2,320
Malaysia
zeng Online content
zeng  Online Content
Joined: Sep 2015
Posts: 2,320
Malaysia
Kindly consider High KV40C 75W90 in Schaeffer 293 or jewels in States in Lucas 75W90.

Re: Looking at 75w90's [Re: buck91] #4782929
06/10/18 10:10 AM
06/10/18 10:10 AM
Joined: Nov 2017
Posts: 254
California
CleverUserName Offline
CleverUserName  Offline
Joined: Nov 2017
Posts: 254
California
Delvac synthetic 75w90 is GL5 and affordable in gallon jugs.

Re: Looking at 75w90's [Re: buck91] #4782940
06/10/18 10:28 AM
06/10/18 10:28 AM
Joined: Mar 2008
Posts: 5,991
Michigan
ZZman Offline
ZZman  Offline
Joined: Mar 2008
Posts: 5,991
Michigan
I have read tests that showed Amsoil #1 and Mobil #2


2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: Looking at 75w90's [Re: buck91] #4782949
06/10/18 10:39 AM
06/10/18 10:39 AM
Joined: Dec 2006
Posts: 18,807
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline
Joined: Dec 2006
Posts: 18,807
Dallas,Tx USA
Look at the gear oil uoas.

Amsoil Severe Gear all the way!! That's all I'll ever use.


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
Quaker State Ultimate Durability 5W20

Re: Looking at 75w90's [Re: buck91] #4782961
06/10/18 10:51 AM
06/10/18 10:51 AM
Joined: Jun 2005
Posts: 684
Danville, Indiana
IndyFan Offline
IndyFan  Offline
Joined: Jun 2005
Posts: 684
Danville, Indiana
I've been running Supertech Synthetic 75w90 in the front diff of my 08 Wrangler, and 85w140 in the rear. It seems to be serving well with no issues. I do some towing with that Jeep, too.


18 Jeep JLUR Wrangler 3.6 10k
15 Ford Transit 100k, Reman 3.5 @85k
08 Jeep Wrangler 3.8 126k
01 Ford F150 Crew 5.4 89k
99 Mercedes E430 Sport 90k
Re: Looking at 75w90's [Re: buck91] #4782984
06/10/18 11:42 AM
06/10/18 11:42 AM
Joined: Dec 2013
Posts: 2,095
socal
barkingspider Offline
barkingspider  Offline
Joined: Dec 2013
Posts: 2,095
socal
Any name brand 75w90 (or 80w90) will do fine. Of the 2 u mentioned, I like Val Syn better than M1


06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)
Re: Looking at 75w90's [Re: CleverUserName] #4782989
06/10/18 11:48 AM
06/10/18 11:48 AM
Joined: Sep 2010
Posts: 7,079
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 7,079
Texas
Originally Posted By: CleverUserName
Delvac synthetic 75w90 is GL5 and affordable in gallon jugs.


Itís now Delvac 1 Ö have had that in G80 for 2-1/2 years now Ö

Re: Looking at 75w90's [Re: buck91] #4783005
06/10/18 12:00 PM
06/10/18 12:00 PM
Joined: Jul 2014
Posts: 273
PA
Patrick0525 Offline
Patrick0525  Offline
Joined: Jul 2014
Posts: 273
PA
@4WD Delvac doesnít have friction modifier. Did you add it to the gear oil? And how much?


'14 Toyota Venza 3.5L 70K mi
TGMO 0W-20/Toyota filter (winter)
PP 0W-20/Fram Ultra filter(spring/summer)


Re: Looking at 75w90's [Re: buck91] #4783047
06/10/18 01:03 PM
06/10/18 01:03 PM
Joined: Oct 2014
Posts: 12,021
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 12,021
Idaho
I have been running syn 75W-140 in everything.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Looking at 75w90's [Re: buck91] #4783089
06/10/18 01:51 PM
06/10/18 01:51 PM
Joined: May 2012
Posts: 953
Rio Rancho, NM
Pajero Offline
Pajero  Offline
Joined: May 2012
Posts: 953
Rio Rancho, NM
Amsoil Severe Gear oil!



Respectfully,

Pajero!


Always remember "Planned obsolescence."

1994 Montero SR 3.5 DOHC, 133,xxx
Fram Ultra/ Snorkel with Pre-filter
K-9-Co-pilot
Re: Looking at 75w90's [Re: buck91] #4783135
06/10/18 03:12 PM
06/10/18 03:12 PM
Joined: Aug 2012
Posts: 3,041
Cincinnati
donnyj08 Offline
donnyj08  Offline
Joined: Aug 2012
Posts: 3,041
Cincinnati
Valvoline or Castrol 75w90 Syntheic. Both under $10 a jug and usually available at autoparts stores.


2008 Silverado Z71 LT 90k Maxlife FS 5w30
2010 Ford Escape 172k QSUD 5w20
2016 Yamaha XSR900 12k, Rotella 15w40 Yamaha Filter.
Re: Looking at 75w90's [Re: buck91] #4783284
06/10/18 06:48 PM
06/10/18 06:48 PM
Joined: May 2012
Posts: 1,558
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline
Joined: May 2012
Posts: 1,558
The land of USA-made Subies!
Motul Gear 300

Re: Looking at 75w90's [Re: Patrick0525] #4784098
06/11/18 05:10 PM
06/11/18 05:10 PM
Joined: Nov 2017
Posts: 254
California
CleverUserName Offline
CleverUserName  Offline
Joined: Nov 2017
Posts: 254
California
Originally Posted By: Patrick0525
@4WD Delvac doesnít have friction modifier. Did you add it to the gear oil? And how much?


Iím also running D1 75w90 in a G80. This type of LS diff. doesnt require any friction modifiers.


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