Basic Maintenance - Engine Oil Change - Page 3 - JeepForum.com

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post #31 of 49 Old 09-27-2009, 08:13 PM
Dreygo
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Aren't you supposed to use 75-90w gear oil in the tranny?

I'm just asking cause that is what I am using and that is what the book says.


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post #32 of 49 Old 09-28-2009, 08:25 AM Thread Starter
Mean Max
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Quote:
Originally Posted by Dreygo View Post
Aren't you supposed to use 75-90w gear oil in the tranny?

I'm just asking cause that is what I am using and that is what the book says.
Here's why I use 10W-30 motor oil.

The Mopar gear oil part number used to be 4897622aa, but when you search that part number you'll see it has been superceded by part number 4761839AC which comes up as 10w-30 motor oil. Here's a link to search the Mopar part numbers.

Discount Mopar Parts Jeep Dodge Chrysler parts & accessories with great service

It's the "new factory spec" lubricant.

Based on that, I use 10w-30 motor oil. I buy the Wal-Mart "Super Tech" store brand oil because it's cheap, meets all the API (American Petroleum Institute) grade qualifications and I change mine often, at least every 6 to 12 months.

Here's my write-up on the easiest way I've found to change the tranny oil in an AX-15 gearbox.

http://www.jeepforum.com/forum/f12/b...change-865520/

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post #33 of 49 Old 09-28-2009, 08:44 AM
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post #34 of 49 Old 09-28-2009, 10:34 AM
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Max, I pose this theory for you and anyone else.
I was told a long time ago that the high capacity oil filter was not as effective at filtering oil as a small or standard size filter because sub-micron size particles would build up around the edges of the already tiny holes in the filter material. These particles would make the holes in effect smaller allowing the filter to remove smaller impurities. So a smaller filter would "plug up" sooner becoming more effective, while a large filter would take longer to reach maximum effectiveness.
Keep in mind that the smaller filter would also loose its effectiveness sooner so an earlier change out would be needed.
I know people who change the filter quite often and top up the oil and extend change intervals quite a bit, often 4 to 6K or longer with almost all miles being on the highway.
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post #35 of 49 Old 09-28-2009, 08:48 PM Thread Starter
Mean Max
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Originally Posted by jeepjerryp7m8 View Post
Max, I pose this theory for you and anyone else.
I was told a long time ago that the high capacity oil filter was not as effective at filtering oil as a small or standard size filter because sub-micron size particles would build up around the edges of the already tiny holes in the filter material. These particles would make the holes in effect smaller allowing the filter to remove smaller impurities. So a smaller filter would "plug up" sooner becoming more effective, while a large filter would take longer to reach maximum effectiveness. Keep in mind that the smaller filter would also loose its effectiveness sooner so an earlier change out would be needed.
Although I think that this may be a "technically" sound theory, to be honest if I have enough sub-micron particles in my engine's oil to be an issue, I'm looking to hard at all of this.

I know people who change the filter quite often and top up the oil and extend change intervals quite a bit, often 4 to 6K or longer with almost all miles being on the highway.
Extending drain intervals and/or running a synthetic oil is usually an attempt to save money or make an attempt at producing peak power or longevity of the engine in question.
Neither of these are on my list, as I spend WAAAY too much on our 3 Jeeps, and if my old '91 with 160,000 miles on it had any looser tolerances the pistons would be swapping holes!

All of this makes for good "shop talk" but when it comes right down to it, I think the only real reason I run a larger filter is because I can.

It's just a little something I figured out that I could do that makes me feel a little better/smarter, possibly in a placebo kind of way.

I guess in many ways I'm just a dumb redneck, and I'm okay with that, it's just my little place in this world.

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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post #36 of 49 Old 09-28-2009, 09:20 PM
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Any pics or advice on a power steering drain and refill? Never could find out how to do that

EDIT
Found it here. http://www.jeepforum.com/forum/f12/a...-fliud-859596/

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Last edited by YJake; 09-29-2009 at 11:24 AM.
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post #37 of 49 Old 09-29-2009, 03:53 PM
beerformeplz
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Just changed my oil on my 4cyl and the larger oil filter works fine on it also. Thanks.
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post #38 of 49 Old 07-23-2010, 07:40 PM
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Thanks alot for this breakdown. I'm new to jeepforum and just started tinkering with my 03 WJ and this was very helpful to a nervous newbie.
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post #39 of 49 Old 10-18-2010, 01:38 PM
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Max,
Didn't you have a pic of a Fram PH8A on this, or a similar, thread/write-up?

Wrenching isn't the problem, it's the brains attached to the hands...unfortunately, I'm lacking some of the former so that's why I'm asking you guys!!

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My YJ is so excited it's leaking oil!
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post #40 of 49 Old 10-19-2010, 06:27 AM Thread Starter
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Max,
Didn't you have a pic of a Fram PH8A on this, or a similar, thread/write-up?
Hmmm, I don't remember.

I used to use the PH16 Fram (same as stock size) all the time and then I used a PH8A to see about the larger size once or twice, so some pics may exist of my Jeeps with the Fram filters.

However after all the negative press I've been seeing with Fram filters and the fact that I can buy Motorcraft & Mopar filters at Wal-Mart for the same (or sometimes less!) than the Fram, I decided to switch.

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Quote:
Originally Posted by UltimatE View Post
Max has a picture of every Jeep part ever made.
Quote:
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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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post #41 of 49 Old 10-19-2010, 11:00 AM
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Quote:
Originally Posted by Mean Max View Post
Hmmm, I don't remember.

I used to use the PH16 Fram (same as stock size) all the time and then I used a PH8A to see about the larger size once or twice, so some pics may exist of my Jeeps with the Fram filters.

However after all the negative press I've been seeing with Fram filters and the fact that I can buy Motorcraft & Mopar filters at Wal-Mart for the same (or sometimes less!) than the Fram, I decided to switch.

Max
Hmm...so what do you use for an air filter?

Wrenching isn't the problem, it's the brains attached to the hands...unfortunately, I'm lacking some of the former so that's why I'm asking you guys!!

Quote:
Originally Posted by YJake View Post
My YJ is so excited it's leaking oil!
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post #42 of 49 Old 10-20-2010, 06:28 AM Thread Starter
Mean Max
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Quote:
Originally Posted by SpideYJeep View Post
Hmm...so what do you use for an air filter?
I have always liked the Wix brand premium filters, but I have typically been too cheap to buy a pricey air filter that I'll end up throwing away because I dunked my Jeep in some deep water.

Then I found out that my local auto parts store carries the whole line of Parts Master products, which are the discount line of parts. The filters (all filters, air, oil, fuel, etc.) are actually Wix filters, without the premium price.

Using my '91 4.0L as an example:

A Wix air filter #46123 has a list price of $12.29

A Parts Master air filter #66123 has a list price of $8.09

Same filter, different box.

As my parts guy said to me, "It's the same as store bread & Wonder bread, same stuff with a different wrapper."

Max

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Quote:
Originally Posted by UltimatE View Post
Max has a picture of every Jeep part ever made.
Quote:
Originally Posted by Benderff View Post
No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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post #43 of 49 Old 10-20-2010, 06:25 PM
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Thanks again Max!

Wrenching isn't the problem, it's the brains attached to the hands...unfortunately, I'm lacking some of the former so that's why I'm asking you guys!!

Quote:
Originally Posted by YJake View Post
My YJ is so excited it's leaking oil!
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post #44 of 49 Old 03-11-2011, 09:14 PM
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Thank you Max, this made my life a lot easier for changing it myself for the first time.
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post #45 of 49 Old 07-29-2011, 10:22 AM
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Quote:
Originally Posted by cmsurfer View Post
That's interesting... I have never heard of changing the filter before draining the oil pan. I guess it's just the way my father taught me that I drain the pan first then change the filter...
Wow....I have been changing my oil for over 40 years.......always pull the plug first........I guess I'll have to give the other way a try.

Never too old to learn!!

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