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Author Topic: Changing Gear Oil -- Close enough?  (Read 8331 times)

Offline Bean Counter

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Changing Gear Oil -- Close enough?
« on: January 09, 2017, 09:36:10 PM »
As a bean counter I can say, mathematically speaking, the difference of 20 to 30 in say the viscosity weight of your motor oil is a much bigger difference than 80 to 90 in your differentials. So my truck wants 5w30 in the engine and that's what it always gets. Does it matter as much in the gear oil? It isn't as plentiful insofar as supply goes and there's a well priced synthetic 75w90 that hasn't caused my truck to fall apart yet. I put it in last go around, but am wondering if I'd be better off getting to 400,000 miles from 300,000 miles if I stick to the SAE 80w in the front and transfer case and 90w in the rear as I think the specs call for. 75w90 good enough all around or need to be exact?

thank.

Offline Dan-o

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Re: Changing Gear Oil -- Close enough?
« Reply #1 on: January 09, 2017, 10:09:01 PM »
Tagging.......   because I've always wondered the same thing.
Member:   Yakstrakgutp (or whatever we are)
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I wonder how many people will touch their nose to their screen trying to read this...

Offline Magnum_Willys

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Re: Changing Gear Oil -- Close enough?
« Reply #2 on: January 09, 2017, 10:10:29 PM »
Synthetic in engines and transfer case is good.  Stay away from synthetics in differentials.  Mfg's and racers will tell you this.  Synthetic just does not cling or cushion like you need in differentials. 

75w-90w is the same as 90w as soon as it warms to operating temp.

----------------------
"Q23. What kind of oil should be used with an Auburn limited-slip differential/ Auburn ECTED Max differential?
A23. Non-synthetic 80w90 GL-5 oil treated with Auburn Gear friction additive, part #504102 (also known as a friction modifier). See Catalog page 32. Three (3) ounces of additive will treat one quart of oil. GM or Ford limited-slip additive may be used. We do not recommend synthetic oil. Auburn limited-slip additive is packed in every box with the differential."
---------------------------




Offline Bean Counter

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Re: Changing Gear Oil -- Close enough?
« Reply #3 on: January 10, 2017, 06:14:46 AM »
Thanks Willy.
I'm doing some research and starting to remember things from a few years ago when I last did this and stuff sounds vaguely familiar. According to my back-of-the-napkin maintenance records I used the same gear oil all around and didn't add the friction modifier to the differential. I haven't had any problems in my Tundra in the last few years. Maybe its for people who tow?

Offline Woodchuck

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Re: Changing Gear Oil -- Close enough?
« Reply #4 on: January 10, 2017, 06:39:01 AM »
Synthetic in engines and transfer case is good.  Stay away from synthetics in differentials.  Mfg's and racers will tell you this.  Synthetic just does not cling or cushion like you need in differentials. 

75w-90w is the same as 90w as soon as it warms to operating temp.

----------------------
"Q23. What kind of oil should be used with an Auburn limited-slip differential/ Auburn ECTED Max differential?
A23. Non-synthetic 80w90 GL-5 oil treated with Auburn Gear friction additive, part #504102 (also known as a friction modifier). See Catalog page 32. Three (3) ounces of additive will treat one quart of oil. GM or Ford limited-slip additive may be used. We do not recommend synthetic oil. Auburn limited-slip additive is packed in every box with the differential."
---------------------------
Um, I run synthetic in the race car in EVERYTHING. Well except for the water in the radiator  :chuckle:. We break in with conventional and after that it goes synthetic.  :twocents:
I highly suggest using the manufacturer's spec. Some pretty smart people put that out there for a reason, even if we don't know what that reason is.
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Offline jackelope

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Re: Changing Gear Oil -- Close enough?
« Reply #5 on: January 10, 2017, 07:46:44 AM »
I agree with Woodchuck. They put those specific fluids in for a reason.
:fire.:

" In today's instant gratification society, more and more pressure revolves around success and the measurement of one's prowess as a hunter by inches on a score chart or field photos produced on social media. Don't fall into the trap. Hunting is-and always will be- about the hunt, the adventure, the views, and time spent with close friends and family. " Ryan Hatfield

My posts, opinions and statements do not represent those of this forum

Offline Bean Counter

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Re: Changing Gear Oil -- Close enough?
« Reply #6 on: January 10, 2017, 08:28:53 AM »
Um, I run synthetic in the race car in EVERYTHING. Well except for the water in the radiator  :chuckle:. We break in with conventional and after that it goes synthetic.  :twocents:
I highly suggest using the manufacturer's spec. Some pretty smart people put that out there for a reason, even if we don't know what that reason is.

Well fine then. I'll use the 80w90. But, they also say to use conventional, not synthetic.  :dunno:

Offline Woodchuck

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Re: Changing Gear Oil -- Close enough?
« Reply #7 on: January 10, 2017, 08:40:11 AM »
Um, I run synthetic in the race car in EVERYTHING. Well except for the water in the radiator  :chuckle:. We break in with conventional and after that it goes synthetic.  :twocents:
I highly suggest using the manufacturer's spec. Some pretty smart people put that out there for a reason, even if we don't know what that reason is.

Well fine then. I'll use the 80w90. But, they also say to use conventional, not synthetic.  :dunno:
That would be the route I suggest.
Antlered rabbit tastes like chicken


Inuendo, wasn't he an Italian proctoligist?

Offline thinkingman

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Re: Changing Gear Oil -- Close enough?
« Reply #8 on: January 10, 2017, 08:48:53 AM »
Synthetic in engines and transfer case is good.  Stay away from synthetics in differentials.  Mfg's and racers will tell you this.  Synthetic just does not cling or cushion like you need in differentials. 

75w-90w is the same as 90w as soon as it warms to operating temp.

----------------------
"Q23. What kind of oil should be used with an Auburn limited-slip differential/ Auburn ECTED Max differential?
A23. Non-synthetic 80w90 GL-5 oil treated with Auburn Gear friction additive, part #504102 (also known as a friction modifier). See Catalog page 32. Three (3) ounces of additive will treat one quart of oil. GM or Ford limited-slip additive may be used. We do not recommend synthetic oil. Auburn limited-slip additive is packed in every box with the differential."
---------------------------
Good advice here.
Use dino oil and buy the TOYOTA friction modifier.
“The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser men so full of doubts.”
― Bertrand Russell

Offline Woodchuck

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Re: Changing Gear Oil -- Close enough?
« Reply #9 on: January 10, 2017, 08:52:55 AM »
Synthetic in engines and transfer case is good.  Stay away from synthetics in differentials.  Mfg's and racers will tell you this.  Synthetic just does not cling or cushion like you need in differentials. 

75w-90w is the same as 90w as soon as it warms to operating temp.

----------------------
"Q23. What kind of oil should be used with an Auburn limited-slip differential/ Auburn ECTED Max differential?
A23. Non-synthetic 80w90 GL-5 oil treated with Auburn Gear friction additive, part #504102 (also known as a friction modifier). See Catalog page 32. Three (3) ounces of additive will treat one quart of oil. GM or Ford limited-slip additive may be used. We do not recommend synthetic oil. Auburn limited-slip additive is packed in every box with the differential."
---------------------------
Good advice here.
Use dino oil and buy the TOYOTA friction modifier.
Just like the manufacturer of that part suggests.  :tup:
Antlered rabbit tastes like chicken


Inuendo, wasn't he an Italian proctoligist?

Offline jackelope

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Re: Changing Gear Oil -- Close enough?
« Reply #10 on: January 10, 2017, 08:58:14 AM »
Synthetic in engines and transfer case is good.  Stay away from synthetics in differentials.  Mfg's and racers will tell you this.  Synthetic just does not cling or cushion like you need in differentials. 

75w-90w is the same as 90w as soon as it warms to operating temp.

----------------------
"Q23. What kind of oil should be used with an Auburn limited-slip differential/ Auburn ECTED Max differential?
A23. Non-synthetic 80w90 GL-5 oil treated with Auburn Gear friction additive, part #504102 (also known as a friction modifier). See Catalog page 32. Three (3) ounces of additive will treat one quart of oil. GM or Ford limited-slip additive may be used. We do not recommend synthetic oil. Auburn limited-slip additive is packed in every box with the differential."
---------------------------
Good advice here.
Use dino oil and buy the TOYOTA friction modifier.
Just like the manufacturer of that part suggests.  :tup:
:fire.:

" In today's instant gratification society, more and more pressure revolves around success and the measurement of one's prowess as a hunter by inches on a score chart or field photos produced on social media. Don't fall into the trap. Hunting is-and always will be- about the hunt, the adventure, the views, and time spent with close friends and family. " Ryan Hatfield

My posts, opinions and statements do not represent those of this forum

Offline Bean Counter

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Re: Changing Gear Oil -- Close enough?
« Reply #11 on: January 10, 2017, 09:54:33 AM »
Thanks hive mind. Trad gear oil it is.

The rocket scientists and brain surgeons that wrote the owners manual don't have the torque specs in there. But, there's instructions on how to lock the doors.  :rolleyes: Time to call Toyota.

Offline jackelope

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Re: Changing Gear Oil -- Close enough?
« Reply #12 on: January 10, 2017, 10:23:11 AM »
Thanks hive mind. Trad gear oil it is.

The rocket scientists and brain surgeons that wrote the owners manual don't have the torque specs in there. But, there's instructions on how to lock the doors.  :rolleyes: Time to call Toyota.

You need a service manual, not an owner's manual. Google is your friend.
:fire.:

" In today's instant gratification society, more and more pressure revolves around success and the measurement of one's prowess as a hunter by inches on a score chart or field photos produced on social media. Don't fall into the trap. Hunting is-and always will be- about the hunt, the adventure, the views, and time spent with close friends and family. " Ryan Hatfield

My posts, opinions and statements do not represent those of this forum

Offline jackelope

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Re: Changing Gear Oil -- Close enough?
« Reply #13 on: January 10, 2017, 10:25:23 AM »
What do you need?
I used my mad rocket science skills to find them online.
:fire.:

" In today's instant gratification society, more and more pressure revolves around success and the measurement of one's prowess as a hunter by inches on a score chart or field photos produced on social media. Don't fall into the trap. Hunting is-and always will be- about the hunt, the adventure, the views, and time spent with close friends and family. " Ryan Hatfield

My posts, opinions and statements do not represent those of this forum

Offline Bofire

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Re: Changing Gear Oil -- Close enough?
« Reply #14 on: January 10, 2017, 10:58:26 AM »
 :) I get my truck serviced when the book says to and I use the stuff the book says. I also use a dealership for my work.
Carl
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