Bolognablake
NAXJA Forum User
- Location
- Franklin Tennessee
Quick question, what's the fluid capacity and recommended oil weight for the AX-15? I don't have a owner's manual.
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Fluid Capacity and weight oil for AX-15
- Thread starter Bolognablake
- Start date
Bolognablake
NAXJA Forum User
- Location
- Franklin Tennessee
~3.5 bottles.
montanaman
NAXJA Forum User
- Location
- Western Montana
AX15 Capacity is 3.7 quarts.
Previous post about GL3 is true, but I would add that GL4 is also acceptable.
Example: Redline's synthetic MT-90 is rated GL4 because of it's superior synthetic qualities. However, it has none of the harsh sulfur-based additives that many oils use to get the GL5 rating.
The AX15 has brass synchro gears, which are corroded by the sulfur additives in GL5 oils. If you run oils with the sulfur additives, you will reduce the lifespan of your synchro gears by about 50%.
I installed the Redline MT-90, and I'm extremely happy with the shifting now -- even in cold weather.
Previous post about GL3 is true, but I would add that GL4 is also acceptable.
Example: Redline's synthetic MT-90 is rated GL4 because of it's superior synthetic qualities. However, it has none of the harsh sulfur-based additives that many oils use to get the GL5 rating.
The AX15 has brass synchro gears, which are corroded by the sulfur additives in GL5 oils. If you run oils with the sulfur additives, you will reduce the lifespan of your synchro gears by about 50%.
I installed the Redline MT-90, and I'm extremely happy with the shifting now -- even in cold weather.
Rick Anderson
NAXJA Forum User
- Location
- Lusby, MD
I'm an XJ Noob, so please patonize the questions;
The Haynes Manual (84-00), specifically recommends GL-5 fluid for the Manual Tranny, which it doesn't specify which manual tranny, just manual tranny. I also wouldn't trust the Haynes, well far less than I can throw it, because I can throw it far and often do (I'm still waiting to find a cheap FSM on E-Bay).
On RedLine Oil's website they say about their own GL-5 fluid 75W90NS;
Would using MT-90 be a little tough on the synchros, since it has friction modifiers that synchros do NOT need, and let them slip longer than designed during shifting? This is all assuming that GL-5 is the actual recommended fluid.
Would a 75-90 Weight Oil like Mobil1 Synthetic GL-5 75-90 or RedLine's 75W90NS, might do better, since it Synthetic and most likely does not have the Sulfur additives, and also not have the friction modifiers?
Personally, I've used Redline MTL in my Neon 5Spd NVT-350 and it worked great as well; but that is a tranny that is designed for fluids with Friction Modifiers.
Again all is speculation on something I have very little experience and making some big assumptions.
The Haynes Manual (84-00), specifically recommends GL-5 fluid for the Manual Tranny, which it doesn't specify which manual tranny, just manual tranny. I also wouldn't trust the Haynes, well far less than I can throw it, because I can throw it far and often do (I'm still waiting to find a cheap FSM on E-Bay).
On RedLine Oil's website they say about their own GL-5 fluid 75W90NS;
RedLine Oil said:
Would using MT-90 be a little tough on the synchros, since it has friction modifiers that synchros do NOT need, and let them slip longer than designed during shifting? This is all assuming that GL-5 is the actual recommended fluid.
Would a 75-90 Weight Oil like Mobil1 Synthetic GL-5 75-90 or RedLine's 75W90NS, might do better, since it Synthetic and most likely does not have the Sulfur additives, and also not have the friction modifiers?
Personally, I've used Redline MTL in my Neon 5Spd NVT-350 and it worked great as well; but that is a tranny that is designed for fluids with Friction Modifiers.
Again all is speculation on something I have very little experience and making some big assumptions.
Bolognablake
NAXJA Forum User
- Location
- Franklin Tennessee
Rick Anderson said:
After I posted this I did some searching using diffrent terms and found out that GL-5 is not, in fact, the correct lubriacant. Jeep put the wrong thing in the owners manuals and early shop manuals. They changed it later on, but most places still have bad information. Any GL-3 or GL-4 gear oil will work.
I just ordered some Redline MT-90 for my AX-15 from JEGs.
http://www.jegs.com/webapp/wcs/stor...eId=10001&categoryId=22263&searchItemId=84671
Rick Anderson
NAXJA Forum User
- Location
- Lusby, MD
Bolognablake said:
Thanks,
I also did a search and read some prevous threads, including first person accounts saying that Mobil1 Synthetic GL-5 did damage the AX-15/5 Synchros. As well, I read some very interesting info from RedLine Oil. They have a White Paper that has some specific insight into the problems discussed here, you have to take into account this is them bragging about their own product, BUT;
http://www.redlineoil.com/whitePaper/10.pdf
I think I have to follow MontonaMan on this and will use MT-90 in my AX-5. I already use MTL in my Neon NVT-350 5spd Manual.
- Location
- Westminster, SoCal
Haynes? That's your answer right there. Anyways IIRC the sequence of events was as follows. From jeep the requirement was GL3 for AX15, then for one year they said GL5 and then they went back to GL3.Rick Anderson said:
Rick Anderson
NAXJA Forum User
- Location
- Lusby, MD
This could explain the mixed results with GL-5 Fluids. In the prevous posts about GL-5/GL-3 issue, some swore that they've used the GL-5 for years and never had a single problems, others used Mobil1 Synthetic or other GL-5 and their synchros were garbage.
Some people are using thier XJ's for off-roading/towing and probably getting the trans fluid above 200°F, and at that point it gets corrosive and eats the syncrhos.
Others are using their XJ's for putting around town and probably never get the trans fluid above 200°F, so the fluid never gets corrosive and thus they never have any problem because of the fluid.
Probably why others are swearing by Redline MTL/MT-90; its got the GL-4 properties which probably shift and perform better than GL-3 fluids, BUT, you'd have to get the fluid above 375°F for it to get corrosive and harm the Synchros. If you get the fluid temp above 375°F your going to get more immediate trans problems than Synchros "BEGINNING" to corrode.
