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Old 12-24-2013, 09:33 AM   #1
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Fluids? Synthetic vs. Non-Synthetic

Greetings!

I am new to the forum (and forums in general) and TJ ownership. I just bought a stock 2004 TJ and am trying to make a few initial decisions. I am going to be changing all the fluids on my new TJ and putting in new spark plugs and am looking for opinions and recommendations. I would also like to know what people think about synthetic vs. non-synthetic, and favorite brands for the following.

-Engine Oil
-Gear Box
-Transfer Case
-Front/Rear Diff.

Also, has anyone installed a K&N filter setup on their TJ, did it make a noticeable difference?

Thanks, Happy Holidays!!!

Metalcolt

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Old 12-24-2013, 09:47 AM   #2
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Another oil thread for X-Mas! And you thought Santa was gonna bring you guys and gals coal!

First Welcome!
Second if you use the search function you will find a plethora of oil threads! Almost as many oil threads as there are wave threads...

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Old 12-24-2013, 09:49 AM   #3
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I like synthetics in the transmission, transfer case, and power steering system but not in the axles or engine. The only time I'd run a synthetic motor oil in the engine would be during the winter if I lived in an area where it was extremely cold where synthetic motor oil does have an advantage.

And it has been proven that the gears in an axle run cooler when lubricated with a conventional gear lube. There are at least several aftermarket axle manufacturers like Currie that will actually void their axle's warranty if they discover it was filled with a synthetic gear lube.

A K&N air filter has been shown in lab tests to be one of the very worst air filters you can buy, it lets in fine dust & dirt like a screen door in a Texas dust storm. Not to mention that the TJ's air intake was specifically designed to be free flowing & non-restrictive so installing a K&N wouldn't improve performance anyway. SOME air intake systems are restrictive so a K&N could make a performance difference there, just not in a TJ. And even if the TJ's air intake was restrictive, not that it is of course, I still wouldn't run a K&N. I'd rather protect my engine with a good air filter than use one that would let more damaging dirt in.
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Old 12-24-2013, 09:53 AM   #4
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Jerry - Thank you very much for the info on this and the other thread I posted!
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Old 12-24-2013, 10:10 AM   #5
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P.S. Since I mentioned the power steering system, 2003 and newer TJs use ATF+4 there, not power steering fluid which is only used in 2002 and older TJs.
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Old 12-24-2013, 10:26 AM   #6
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K&N Modifications

I was given a K&N FIPKII as a gift and after running it for 2 yrs., I decided to improve the filtration with an AEM filter for a Dodge Ram 1500 pickup.



I'm leaving oil for the motor, so no more MAF sensor issues!


AEM filters much better. I always pull the intake and check for dust.


My AEM part number for the Jeep TJ K&N Intake w/Dodge 1500 Conical Filter


The AEM even looked better (when new).LOL


I still run K&N Oil Filters
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Old 01-05-2014, 04:31 PM   #7
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Well, here is the decision for now. I used Redline products in my 2001 7.3L F-250 and just realized that I have five gallons of ATF that I was intending to use for a transmission service in the future when it cam due, but I am now selling the truck. The shop is going to let me swap it for other Redline products so I am going to do the following:

Motor Oil: Redline 5w-30

Gearbox (NV3550): Redline MTL

Transfer Case (NV231): Redline C+ ATF

Front Differential, Dana 30 (currently 3.07 will change to 4.10): Redline 75w-90 GL-5

Rear Differential, Dana 35c (currently 3.07 will change to 4.11): Redline 75w-90 GL-5, maybe 75w-140 since I am changing the gears?

I have also decided that I will not use a K&N air filter. However, I am thinking about the Spectre cold air intake because the intake pulling from the cowl vent chamber seems like an interesting idea and it makes room for the lockable storage compartment that you can install where the factory air box is. Seems like a pretty interesting idea. Has anyone had any experience with this? I will probably just sick with the factory air box and a good filter, I agree and see the sense in Jerry's comments above.
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Old 01-06-2014, 11:43 AM   #8
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Quote:
Originally Posted by Jerry Bransford View Post
I like synthetics in the transmission, transfer case, and power steering system but not in the axles or engine. The only time I'd run a synthetic motor oil in the engine would be during the winter if I lived in an area where it was extremely cold where synthetic motor oil does have an advantage.

And it has been proven that the gears in an axle run cooler when lubricated with a conventional gear lube. There are at least several aftermarket axle manufacturers like Currie that will actually void their axle's warranty if they discover it was filled with a synthetic gear lube.

A K&N air filter has been shown in lab tests to be one of the very worst air filters you can buy, it lets in fine dust & dirt like a screen door in a Texas dust storm. Not to mention that the TJ's air intake was specifically designed to be free flowing & non-restrictive so installing a K&N wouldn't improve performance anyway. SOME air intake systems are restrictive so a K&N could make a performance difference there, just not in a TJ. And even if the TJ's air intake was restrictive, not that it is of course, I still wouldn't run a K&N. I'd rather protect my engine with a good air filter than use one that would let more damaging dirt in.
I totally agree..but I have a question..my rubicon came with synthetics in the diffs from factory so that's what I've been using.also I was under the impression that synthetics in the diffs may also help out fuel mileage a bit,and synthetics don't mix with water if it happens to get in the diff,still giving you adequate lubrication..are the rubicon air locker diffs the exception or do you think regular gear oil would be better??
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Old 01-06-2014, 07:39 PM   #9
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When your Jeep is under warranty, run whatever the factory manual says. Since my Rubicon is long out of warranty, I run conventional 85W-140 in my Rubicon... either Valvoline or Torco.
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Old 01-06-2014, 09:05 PM   #10
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Full synthetic Amsoil from day of outchase till the day I die

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