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#4570338 - 11/10/17 09:18 PM Dino or Synthetic for Differentials?
Gebo Offline


Registered: 09/18/02
Posts: 2077
Loc: VA
I just read a post in this forum where a very knowledgeable person said that the "Golden Rule was to use Dino in the Rear." That really got my attention. I want to know more about this. Anybody got time for their input? I have a teachable spirit....
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#4570341 - 11/10/17 09:22 PM Re: Dino or Synthetic for Differentials? [Re: Gebo]
Crispysea Offline


Registered: 04/14/17
Posts: 400
Loc: TN USA
I used dino on my diff because it cost half as much. It works fine. I don’t see much of a need for synthetic unless you pull heavy loads constantly.

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#4570342 - 11/10/17 09:24 PM Re: Dino or Synthetic for Differentials? [Re: Gebo]
Gebo Offline


Registered: 09/18/02
Posts: 2077
Loc: VA
I'm being serious, not smart aleck. Does that make it the "golden rule"? Are there chemical properties in dino that make it superior in a rear end?
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#4570349 - 11/10/17 09:40 PM Re: Dino or Synthetic for Differentials? [Re: Gebo]
BHopkins Online   content


Registered: 11/03/13
Posts: 1095
Loc: Utah
I have never heard about the Golden Rule for differential fluids. However, I would never use anything but a synthetic in a differential in a cold weather climate. This isn't the video I was looking at, but it demonstrates the difference between a dino and a synthetic diff fluid in cold weather. While the synthetic is a 75W and the dino is an 80W, the dino still doesn't offer flow like it should, even when it reaches the temperature where it is supposed to start working.

https://www.youtube.com/watch?v=fuwunDgEVMs
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#4570355 - 11/10/17 09:51 PM Re: Dino or Synthetic for Differentials? [Re: Gebo]
LoneRanger Offline


Registered: 07/02/07
Posts: 4044
Loc: Midwest USA
Dino (conventional) adheres to the gears better than synthetic.
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#4570371 - 11/10/17 10:09 PM Re: Dino or Synthetic for Differentials? [Re: LoneRanger]
2015_PSD Online   content


Registered: 09/26/10
Posts: 7231
Loc: SE Texas
Originally Posted By: LoneRanger
Dino (conventional) adheres to the gears better than synthetic.
Based upon what? Any factual information to share to substantiate this statement?
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#4570394 - 11/10/17 10:42 PM Re: Dino or Synthetic for Differentials? [Re: Gebo]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
IMO, if it's a regular use rear-end and not for towing or hauling heavy loads I would use conventional at the right viscosity recommended by the manufacturer for the climate it's operated in. Otherwise I would go to synthetic for higher heat applications.

Dino does not "adhere" better to anything unless you are talking about deposits in an engine. grin2



Edited by StevieC (11/10/17 10:44 PM)
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#4570399 - 11/10/17 10:48 PM Re: Dino or Synthetic for Differentials? [Re: LoneRanger]
4WD Online   confused


Registered: 09/21/10
Posts: 6350
Loc: Texas
Synthetic “adheres” to that little book that comes in the glove box… some may have noticed OEM’s spec synthetic in gear sets before it became more common in the ICE …

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#4570463 - 11/11/17 04:09 AM Re: Dino or Synthetic for Differentials? [Re: Gebo]
dlundblad Online   happy


Registered: 09/30/13
Posts: 9998
Loc: Indiana
It boils down to a.) following your owners manual and b.) personal preference.

That said, I wouldn't think dino vs. synthetic would be backwards compatible.
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#4570473 - 11/11/17 04:33 AM Re: Dino or Synthetic for Differentials? [Re: Gebo]
69GTX Offline


Registered: 09/23/15
Posts: 3815
Loc: Connecticut
Some differentials require conventional....such as Auburns with cone clutches.
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2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
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#4570502 - 11/11/17 05:23 AM Re: Dino or Synthetic for Differentials? [Re: Gebo]
Sayjac Offline


Registered: 10/13/08
Posts: 12247
Loc: The Old North State
Never heard of that golden rule. Currently running Castrol Syntrax 75w90 Synthetic in an 01 Tacoma with OM spec of 80w90 dino. Purchased on AZ close out <$5 a bottle. Guess that means that's one 'golden rule' I won't be observing.

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#4570510 - 11/11/17 05:36 AM Re: Dino or Synthetic for Differentials? [Re: 69GTX]
krismoriah72 Offline


Registered: 02/16/09
Posts: 1515
Loc: wv
I think the real 'golden rule' for differentials is to have the proper levels of lubrication.


Here is a decent thread from a few yrs ago.

https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1472615

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#4570511 - 11/11/17 05:42 AM Re: Dino or Synthetic for Differentials? [Re: 69GTX]
dlundblad Online   happy


Registered: 09/30/13
Posts: 9998
Loc: Indiana
Originally Posted By: 69GTX
Some differentials require conventional....such as Auburns with cone clutches.


You made BITOG's first frog hair splitting post of the day. laugh

How many members does this post apply to anyways?
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#4570520 - 11/11/17 05:59 AM Re: Dino or Synthetic for Differentials? [Re: Gebo]
Artem Offline


Registered: 10/30/10
Posts: 5109
Loc: Florida
Depending on the type of rust bucket you're servicing... "The Best or its pointless" <-- consider that the Platinum Rule.
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#4570532 - 11/11/17 06:21 AM Re: Dino or Synthetic for Differentials? [Re: Gebo]
zeng Offline


Registered: 09/01/15
Posts: 2183
Loc: Malaysia
It's the [email protected]*C that matters.
Oh yes, dino has higher pressure-viscosity coefficient than synthetics god in PAO's providing thicker MOFT for stronger components protection as a primary function of lubrication, all other parameters are secondary.


Edited by zeng (11/11/17 06:24 AM)

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