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Open Roads Forum  >  Class A Motorhomes

 > Good quality synthetic rear differential gear oil

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lfeather

Titusville, FL

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Posted: 06/23/12 06:09am Link  |  Print  |  Notify Moderator

Captain_Happy wrote:

I wouldn't be using sythesia oil in my rear end after what my mechanic told me about how thin this kind of oil can get when it gets hot. It doesn't stick to the drive shafts long enough to get to the outer wheel bearings. He ought to know, he works on these things.


I disagree with your mechanic's assessment. The low viscosity (thinness)is one major benefit of synthetic oil, allowing it to reach/lubricate all those small spaces that dino oil can't reach, with superior lubrication properties at all temps to include very cold temps. Dino oil breaks down under very hot or overtemp conditions, while synthetic oil still provides protection. Jet engines must use syntetic because dino oil can't withstand the extremely hot temps. I have been running sythetic oils in all my vehicles for over 30 years.


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The Texan

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Posted: 06/23/12 06:19am Link  |  Print  |  Notify Moderator

Captain_Happy wrote:

I wouldn't be using synthetic oil in my rear end after what my mechanic told me about how thin this kind of oil can get when it gets hot. It doesn't stick to the drive shafts long enough to get to the outer wheel bearings. He ought to know, he works on these things.
If my mechanic told me that, it would have been my last visit to his shop. Wrong knowledge, is worse than no knowledge.

I use Lucas synthetic diff oil in my HR, as that is what the factory service center said to use and what they used, at the time.


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Wills250psd

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Posted: 06/23/12 06:36am Link  |  Print  |  Notify Moderator

Lucas, but its not cheap

jimhaz2402

Crossville, TN USA

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Posted: 06/23/12 07:05am Link  |  Print  |  Notify Moderator

Ditto and ditto on Mobil Delvac. If you're a member of FCOC, you get a discount on it @ O'Reilly Auto Parts. jim

amxpress

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Posted: 06/23/12 07:45am Link  |  Print  |  Notify Moderator

Here's a couple of links to the "over rated" synthetic gear oil that I have used for over 30 years with excellent results (as have millions):
http://www.amsoil.com/storefront/svg.aspx
or
http://www.amsoil.com/storefront/fgr.aspx

As subjective as using synthetic is on this forum, you can't beat it for overall performance when compared to dino oil, whether it's in your engine, differential, or transmission.


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rexabbot

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Posted: 06/23/12 07:45am Link  |  Print  |  Notify Moderator

rvrepairnut wrote:

agesilaus wrote:

Lots of people use Amsoil

one of the worst over rated gears oil of all time


Give details - don't just throw out opinions.

Daveinet

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Posted: 06/23/12 08:01am Link  |  Print  |  Notify Moderator

First of all, Penzoil is indisputably junk. Do not use it. Their engine oil looses viscosity long before the normal oil change interval, I can only imagine what their gear oil is like. DO not use Lucas either. At higher speeds, their treatment causes the oil to foam up.

Amzoil Severe Gear is pretty good, or Royal Purple Max Gear. I did a bunch of research when I blew my diff last fall. Mostly finding out what off road racers are using. These are guys that tare up differentials in single race. Its not uncommon to rebuild the diff every race. Not too much bias to their opinions, as they operate in survival mode and can't afford to be wrong.


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Weathertodd221

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Posted: 06/23/12 08:03am Link  |  Print  |  Notify Moderator

Daveinet wrote:

First of all, Penzoil is indisputably junk. Do not use it. Their engine oil looses viscosity long before the normal oil change interval, I can only imagine what their gear oil is like. DO not use Lucas either. At higher speeds, their treatment causes the oil to foam up.

Amzoil Severe Gear is pretty good, or Royal Purple Max Gear. I did a bunch of research when I blew my diff last fall. Mostly finding out what off road racers are using. These are guys that tare up differentials in single race. Its not uncommon to rebuild the diff every race. Not too much bias to their opinions, as they operate in survival mode and can't afford to be wrong.


what kinda racers?? Nascar have differential coolers.

Sully2

Cincinnati

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Posted: 06/23/12 09:40am Link  |  Print  |  Notify Moderator

rvrepairnut wrote:

agesilaus wrote:

Lots of people use Amsoil

one of the worst over rated gears oil of all time


Amen brother!


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Sully2

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Posted: 06/23/12 09:46am Link  |  Print  |  Notify Moderator

I wouldnt be afraid to use Pennzoil Syn in my coach. I DO use it in my front hubs.

You might also look at Castrol Syn in the proper weight. None of them are cheap by a long shot, so just grit your teeth and bear it. After all its not like you change it every 7000 miles or so.

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