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HELP with GEAR LUBE needed #5231974 10/06/19 12:14 PM
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Kira Offline OP
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My vehicle-a 2005 Ford Ranger with open differentials- calls for 80W-90 gear lube.

I'd like to use synthetic but the only 80W-90 synthetic I've found has friction modifiers already mixed in.

Will using lube with friction modifiers in my plain diffs hurt 'em?

Also, a synthetic 75W-90 is available without FMs. Can I use that or are differentials that sensitive to weight?

I need to know as the sales are going on now.

Re: HELP with GEAR LUBE needed [Re: Kira] #5232018 10/06/19 01:16 PM
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fozzdesy2001 Offline
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75W-90 is good with or without friction modifiers. I use Mobil 1 75W-90 in my Subarus all the time.


2001 Subaru Forester S
Replaced with a 2006 Forester

2004 Subaru Forester XT
Death by deer. Replaced with 2003 Impreza Outback Sport (beater)
Re: HELP with GEAR LUBE needed [Re: Kira] #5232019 10/06/19 01:17 PM
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SubieRubyRoo Offline
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Motul Gear 300

Or Amsoil Severe Gear.

Re: HELP with GEAR LUBE needed [Re: Kira] #5232020 10/06/19 01:17 PM
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Warstud Offline
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Originally Posted by Kira
Also, a synthetic 75W-90 is available without FMs.


Go ahead and use the 75W-90 without FM's. You can also use it with FM's if you would like....no harm. Most Conventionals are 80W-90

Re: HELP with GEAR LUBE needed [Re: Kira] #5232028 10/06/19 01:25 PM
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geeman789 Offline
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Most light load differentials with out a limited slip don't need anything special oil wise. Synthetic will work slightly better if it gets really cold ... but pretty much any 75/80w90 will work just fine.

And many people NEVER change the rear diff. oil, ever. Not many fail if they have ANY oil in them at all ...


2011 SUBARU Impreza 5-door manual / 2016 HONDA Pilot / 2011 MAZDA 2 auto
Re: HELP with GEAR LUBE needed [Re: SubieRubyRoo] #5232042 10/06/19 01:40 PM
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Gebo Offline
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Originally Posted by SubieRubyRoo
Motul Gear 300

Or Amsoil Severe Gear.



+1 Amsoil has a 80W-90


'98 LEX LS400 300K
'02 4Runner 245K
'05 Lex LS430 85K
'07 Lex GX470 65K

Shell Gas and Truck & Supertech Full Syn HM
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: HELP with GEAR LUBE needed [Re: Kira] #5232048 10/06/19 01:43 PM
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oldhp Online Content
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With open differentials it doesn't matter FM's or not. FM's are for posi clutches so they won't chatter when turning. Any 75W90 will do excellent for your Ranger. If you would be pulling something I might jump up to 75W110 in the rear dif, but that's as thick as I would go. Enjoy!!!!

Last edited by oldhp; 10/06/19 01:43 PM.

"None of us are getting out here alive.....drink that beer.....eat that pizza......drive that Hot Rod"
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Re: HELP with GEAR LUBE needed [Re: Kira] #5232079 10/06/19 02:12 PM
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RISUPERCREWMAN Offline
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No worries


2018 Ram 2500 HD 6.4 Hemi Crew Cab 10,000Mi
8'Boss SuperDuty Plow
2017 Harley Davidson Milwaukee 8 Limited 10KMiles
2009 Toyota V6 XLE Camry 84K miles
Re: HELP with GEAR LUBE needed [Re: Kira] #5232112 10/06/19 02:52 PM
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simple_gifts Offline
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I am using Mobil 1 75W-90LS in my B2300 (ranger)

I will advise checking or replacing the diff cover as mine rusted thru in < 10 years.


2004 Prius; 118K; ALM
2007 Yaris 98K ATM
2006 B2300;137K;ALM


Was driving an ox cart; Now on the USS Enterprise
Re: HELP with GEAR LUBE needed [Re: Kira] #5232124 10/06/19 03:00 PM
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Silverado12 Offline
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Esp. since you're up north I would use 75W-90 like the others said. I use Valvoline and had good results with spider gear wear, but I'm sure there are more premium brands out there that may do better.


12 Chevy Silverado ext. cab LS, 2WD 4.3 auto
18 Mustang GT 5.0 auto
07 Harley Dyna Street Bob 96 c.i. 6 sp.
00 Mustang GT auto
Re: HELP with GEAR LUBE needed [Re: Kira] #5232136 10/06/19 03:20 PM
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Whimsey Online Content
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Our 2017 Explorer comes with a "lifetime" fill of non synthetic 80W-90, Yeah right! At 22,500 miles I vacuumed out as much of the nasty factory fill as I could and added Amsoil Severe Gear 75W-90. At 49,000 miles now it's been fine. At around 75,000 miles I'll do another vacuum drain and refill with Amsoil 7W-90. Due to the rear suspension set up it's almost impossible to to remove the rear diff cover as you would usually do, hence vacuuming it out is the most viable way. In cold climates the synthetic 75W-90 gear oil will be helpful vs the non synthetic 80W-90.

Whimsey

Re: HELP with GEAR LUBE needed [Re: Kira] #5232184 10/06/19 04:19 PM
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khittner Offline
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Super Tech synthetic 75w-90 will serve you well at 1/3 the price of others.

Re: HELP with GEAR LUBE needed [Re: Kira] #5232253 10/06/19 06:02 PM
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ARCOgraphite Offline
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+1 Supertech under 6 bucks a bottle. Did the Subaru rear member. It was whining with whatever the Subaru dealer put in.

No Whine now.
.

Last edited by ARCOgraphite; 10/06/19 06:24 PM.

2019 VW Jetta S 6MT OCI#1 5885mi-Castrol Edge Prof? VW508+VW Service Filter; '17 Subaru Crosstrek CVT OC#7 52665mi-Castrol GTX Magnatec 5W20 + SOA Filter
Re: HELP with GEAR LUBE needed [Re: Kira] #5236222 10/10/19 06:52 PM
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Kira Offline OP
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You guys are tops.
Oddly, this is the subject which landed on all my "Bob nerves". It was bad.
First, I freaked for not knowing EXACTLY what friction modifiers did....I never knew but I had to know now instantly.
Then the answer to "Why are there 75W AND 80W-90 oils?" somehow had to be VERY important and I had to know.

I was actually uncomfortable. THEN I remembered the pedestrian nature of my trucklette and came back to Earth.

I bought enough Car Quest 80W-90 conventional on sale at AAP for ~$18.00.

If horror fluid oozes from my diffs it can serve as a cleanse. Then I'll make a decision on something fancy.

The Fumoto valve arrived today....and it's not what you think.




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