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Old 02-01-2010, 12:05 AM   #1
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manual transmission oil change?

how often do you change the oil in your manual transmission?

and what oil is the best?

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Old 02-01-2010, 09:14 AM   #2
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I don't pay attention to the mileage...something my Dad taught me. Check the dipstick, when it looks dark, go ahead and change it out. I've used cheap oil and mid-grade oil filters for the whole time I've owned it. I now have over 200K miles on it and am religous about changing the oil when it looks dark. This method works for me.

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Old 02-01-2010, 10:13 AM   #3
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I am approaching 50K on my 6 speed and decided to flush mine along with a bunch of other things I was doing. I don't think it really needed it, but it gave me some peace of mind knowing there's plenty of fresh oil in there after hearing some of the horror stories about Jeeps coming almost dry from the factory. I went ahead and used the Mopar Manual Trans Fluid from the Stealership...it's not cheap and ran 20 bucks a bottle, but only took two.
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Old 02-01-2010, 12:16 PM   #4
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well ive got a 5 speed and ive never changed out the oil before. can anyone tell me what i need ? and how to do it?

theres a fill plug and a drain plug right? does anyone have a pic of where each one is? and whats the best way to refill it?
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Old 02-01-2010, 01:04 PM   #5
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Get a Chiltons, Haynes or Clymers manual. They are usually very thorough with pictures and step by step instructions. I plan on doing mine soon and will go with full synthetic.
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Old 02-01-2010, 02:08 PM   #6
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I decided to change mine at 26k miles. I went with Royal Purple Synchromax. For what it's worth, I canged the transfer case oil and both diffs at the same time. I plan on doing it again at 50k miles.
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Old 02-01-2010, 03:43 PM   #7
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Quote:
Originally Posted by thechink09 View Post
well ive got a 5 speed and ive never changed out the oil before. can anyone tell me what i need ? and how to do it?

theres a fill plug and a drain plug right? does anyone have a pic of where each one is? and whats the best way to refill it?
Locations of drain and fill plugs are in your manual as well as capacities.
I have about 30k on synthetic in trans, differentials and transfer case, thinking about changing it again...maybe.
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Old 02-01-2010, 07:13 PM   #8
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As mentioned, check your manual for the plug locations and quanities as your's is different than mine. Make sure you have the right size allen for the plugs . . . I had to buy a set of big allen sockets as the drain plug is 17mm. As always, be sure to remove the fill plug first . . . duh, I know!!! Drain it and then put the drain plug back in and squirt oil in it until it comes out the fill hole, and then put the fill plug back on . . . it's really that simple. I used one of the 18" rubber hoses that screws onto the bottle and just squeezed it to get the oil in . . . a pump would have been nice, but this worked just fine for me.
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Old 02-01-2010, 09:17 PM   #9
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I found that using a metric bolt with a 17mm head and a couple jam nuts, you can make a tool that will remove the allens without paying thru the nose for an actual wrench. Just food for thought.
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Old 02-02-2010, 02:17 AM   #10
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on the NP231, the fill and drain plugs are 30mm.
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Old 02-02-2010, 08:54 PM   #11
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Okay, I don't know what year you have. I have a 94 2.5L 5 speed and just changed it recently. The fill plug is actually in a pain in the @$$ place. there are, however, several allen wrench plugs on the transmission, they all say "DO NOT REMOVE". The one you want, if you have the AX-5 Transmission found in most 2.5L's, is on the right (Passenger) side of the transmission, next to the exhaust. It can be taken off with a wrench, size 14 or 17 I believe. The Drain plug is directly on the bottom of the transmission, just look up through the one hole in the skidplate, or just forward of the skid plate...Also just a wrench. I got lazy for putting the oil in..I shouldn't have. Save yourself the time and mess, buy a hand pump for oil somewhere. What I did was put an appropriately sized hose I had laying around in the fill hole after draining it and replacing the drain plug, and ran it up to where I could stand next to the jeep with the gear oil bottle pressed into the hose. If the hose is in good shape, you can squeeze it to force oil into the transmission. If not (Like me..) squeezing will just split the hose by your hand and you have to let it all slowly run down the hose via gravity...and that takes a long time. I wanted Royal Purple, but stupid Advance Auto didn't have enough, so I ended up getting some pennzoil. Takes 3.5 Quarts...took almost 4 in mine. Probably because of the split hose.
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Old 10-10-2010, 04:52 PM   #12
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have a 98 2.5L and 5 spd (ax-5 i beleive) It has 2 allen headed plugs in it-any one know the size?? all i know for sure is a 1/4 drive is too small and a 3/8 is too big.
i know it's probably a metric allen-but what size?? Got all the fluids and figured it would be a simple process like checking the front diff was(3/8 drive i beleive) why can't they keep things either metric ot english-what a pain and not about to spend $30 for a 3/8 drive metric allen head set.
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Old 10-10-2010, 05:52 PM   #13
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Dunno about the AX-15, but I believe the NV uses 9/16. I use the head of a disposable bolt and vice grips on the threads since I don't have an actual 9/16 Allen wrench.
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Old 02-15-2011, 04:25 PM   #14
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i have 97 tj 6cyl 5 speed what weight oil brand and amount do i need,purple ???
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Old 02-15-2011, 04:27 PM   #15
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sorry for the tranny
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Old 02-15-2011, 05:26 PM   #16
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Quote:
Originally Posted by thechink09 View Post
how often do you change the oil in your manual transmission?

and what oil is the best?
Since you have the 4.0L, you should have the AX-15 tranny:
Basic Maintenance - AX-15 Oil Change - JeepForum.com
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Old 08-21-2011, 01:52 PM   #17
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I was about to ask how I knew which transmission I had until I ran across this post. I have a 94 with a 4.0L engine, so I guess that means I should have the AX-15 tranny and the NP231 transfer case, right? Also, thechink09, I took a look at your Jeep profile, and I love the fact that under in-car entertainment, you put 4.0L engine 5-speed. That's awesome!
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Old 08-21-2011, 03:26 PM   #18
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I just changed my trans fluid. I used Mobil 1 Synthetic 75W-90(same as both differentials). I plan to do it again in 50K.
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Old 10-11-2013, 01:44 PM   #19
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What fuilds do i use in a jeep 1995 wrangler 5 speed manual transmission also what to use in transfer case every tells me something like using 10w30
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Old 10-11-2013, 02:28 PM   #20
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What fuilds do i use in a jeep 1995 wrangler 5 speed manual transmission also what to use in transfer case every tells me something like using 10w30
You can use 75W90 gear oil or 10W30 motor oil for the trans. I would use full synthetic for whatever one you choose. I would only use ATF or ATF+4 in the transfer case. Choose the brand you like.
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Old 10-11-2013, 03:46 PM   #21
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A few thoughts:

1) If you are offroading in deep water, check/change your transmission and diff fluid more often. And check all your vent hoses frequently too.

2) My Jeep isn't a DD, so I don't put many miles on it. Someone recommended 50K for a change - that might be a decade for me! I'd probably do it every other year or so, even on a low annual mileage Jeep.

3) I put the cheapest 10W30 motor oil from Walmart in my AX5, and it shifts great. No need for expensive synthetics, as far I can see.

4) Similarly, I'm using Walmart very cheap gear oil in both my diffs. Again, for its low cost. Many people (East Coast Gear Supply, Currie, etc) recommend regular gear oil and not synthetics for differentials.

No need to spend extra money if it isn't warranted. Although I do put synthetic motor oil in my engine - Mobil 1 High Mileage.
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Old 10-11-2013, 03:51 PM   #22
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Quote:
Originally Posted by ashevilleyjmike View Post
I don't pay attention to the mileage...something my Dad taught me. Check the dipstick, when it looks dark, go ahead and change it out. I've used cheap oil and mid-grade oil filters for the whole time I've owned it. I now have over 200K miles on it and am religous about changing the oil when it looks dark. This method works for me.
Manual Transmissions do not have filters or dipstick .............. Re-Read the
OP's post !

I used Royal Purple Syncromesh in my Trans.

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