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View Poll Results: What brand?
Royal purple 3 18.75%
Lucas 4 25.00%
Mobile one 3 18.75%
cheaper the better 6 37.50%
Voters: 16. You may not vote on this poll

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Old July 18th, 2011, 12:04 PM   #1
JeepInABox
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Default lucas, amsoil,mobile, royal

I need some 75w 140 for a 05 dakota open diff.
What brand do you use?

added amsoil but can't add to poll

Last edited by JeepInABox; July 18th, 2011 at 12:27 PM.
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Old July 18th, 2011, 12:25 PM   #2
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You listed Amsoil in the thread title but didn't list it as an option....but it is what I use
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Old July 18th, 2011, 04:25 PM   #3
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Quote:
Originally Posted by JeepInABox View Post
I need some 75w 140 for a 05 dakota open diff.
What brand do you use?

added amsoil but can't add to poll
Answer really depends on what you're going to do with it. If you don't drain it a lot and don't wheel it you could run the higher end stuff. If it's for a wheeler, I'd use cheaper stuff knowing that it's going to be changed several times a year.
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Old July 18th, 2011, 04:34 PM   #4
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Amsoil or Royal Purple
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Old July 18th, 2011, 05:39 PM   #5
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Quote:
Originally Posted by Jeeperz Creeperz View Post
Answer really depends on what you're going to do with it. If you don't drain it a lot and don't wheel it you could run the higher end stuff. If it's for a wheeler, I'd use cheaper stuff knowing that it's going to be changed several times a year.
That's an excellent point and certainly something you should give due consideration
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Old July 19th, 2011, 05:06 AM   #6
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it's a buddies 2wd dakota that he uses as a dd.
I'm new to the 75w 140 gear oils, all mine take 80w 90
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Old July 19th, 2011, 05:28 AM   #7
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Quote:
Originally Posted by JeepInABox View Post
it's a buddies 2wd dakota that he uses as a dd.
I'm new to the 75w 140 gear oils, all mine take 80w 90
I'm new to that stuff as well. I have done some researching on it and it seems Royal Purple and Amsoil (with the little research I have done) are on about the same level. I was in this exact same boat a couple days ago trying to decide which brand to go with and finally settled on Royal Purple personally. I still need to order it though lol. Realistically speaking, unless you are going to be using the oil in a performance setting like racing or something, they are probably all on about the same level. I know nothing about Lucas so I can't speak to that, but I have looked into Royal Purple, Amsoil, and Mobil 1 and they are about the same unless you start getting into the molecular difference in molecule bonding and retaining levels. At that point one would be better though I have not delved that deeply into the science that is gear oil to know one way or the other... The way I was looking at it for my use, I can get Mobil 1 from Autozone for 18.99 a quart for 75w140. Through Amazon, Jegs and up until 2 days ago 4 Wheel parts, they all had Royal Purple for $17.99 a quart. Taking into account local pricing being higher than online it figured out to be not much more to just get the Royal Purple. In my opinion of what I have looked into for both oils, Royal Purple seems to be better between the 2, hence my decision to just use that. Also though, a lot of shows my buddy has shown me on spike that do a lot of performance stuff for offroad or drag cars, they only use Royal Purple.

What I would suggest, look at it this way. Unless you are doing something along the lines of a performance setup/build or whatnot, you wouldn't need the best of the best. It would be almost a waste of money. At the same time, you don't want junk either. If you are looking for something that is locally available, I would go with the cheaper of Amsoil, Royal Purple or Mobil 1. Like Jeeperz Creeperz said, if you are changing the fluid a lot, you would be fine with a lower quality fluid. Any of those choices would be fine for the application mentioned, just a matter of how much you want to pay for it at this point... Best of luck with it all.

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Old July 19th, 2011, 05:31 AM   #8
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Dude, You are making way too much out of this!
If you are comfortable with a certain brand of 80w90 do you think that their 75w140 is that much differant?
Pick a high quality brand and run it.
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Old July 19th, 2011, 08:46 AM   #9
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for a dd vehicle i use amsoil
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Old July 19th, 2011, 08:48 AM   #10
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does it matter, people drive these things for a couple hundred thousand miles with the stock gear lube in them and never change it. i bet the rear end out lives the truck
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Old July 19th, 2011, 04:31 PM   #11
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Quote:
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does it matter, people drive these things for a couple hundred thousand miles with the stock gear lube in them and never change it. i bet the rear end out lives the truck
Agreed!!!!!!!
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Old July 20th, 2011, 12:41 PM   #12
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Dale and Casey are both on track. Run some cheap synthetic and be done with it. Hell in my 2000 f150 i changed the real end lube from synthetic out for 80-90w and drove it for 75,000 more miles and never had any issues. In fact i use dino oil in everything.
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Old July 20th, 2011, 01:24 PM   #13
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As a point of interest, True HI-9 recommends NOT using synthetic. They have found that their center sections hold up better with a good grade petroleum base oil.

With that, I agree with Casey and Dale. I don't run synthetic in my dif's because they get changed way more often than necessary simply due to other maintenance items. I use synthetic in my engine because of heat and abuse.

Lots of good reading here.
http://www.bobistheoilguy.com/
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