JeepinSoldier Posted October 3, 2009 Share Posted October 3, 2009 I have a 1990 4.0 4x4 with the AX 15 5 speed. Did use the search before posting this. First I used the transmission thread and identified my transmission as the AX 15. The transmission sometimes does not want to shift into first or reverse. and sometimes second and third feel rough. All symptoms when cold. Once the transmission heats up it shifts fine. Another Jeeper said change the oil in it. He recommended first using regular 75W - 90 to clean it out a little, then switching to a synthetic. What synthetic would the Comanche experts recommend! :bowdown: Mobil1? Royal Purple? Amsoil? What oil would you recommend for a 4.0 with 183,000 miles? Link to comment Share on other sites More sharing options...
wallisek Posted October 3, 2009 Share Posted October 3, 2009 I use mostly Redline synthetics for my driveline. Royal Purple is really good stuff too. I would just change the fluid once with a good synthetic, I doubt using regular gear oil is going to do much of anything. If your transmission is acting up it is probably just showing it's age and 183k of wear. Might want to keep a rebuild in mind for the future. I use Redline MTL for all my jeep manual transmissions. Link to comment Share on other sites More sharing options...
whowey Posted October 3, 2009 Share Posted October 3, 2009 You need to make sure that you are not using a GL-5 rated gear lube in your manual. GL-5 lubes contain sulfur as an additive that will damage the synchro rings in your transmission. Synthetic lubes by nature a more cleansing that conventional ones. So there is no need to use a conventional lube to "clean things out" than switch to a synthetic. In fact it would be counter-productive. For engine oil, you need to make sure that you use an oil that meets the older API-SL specification rather than the newer API-SM specification. The levels of the protective elements(zinc and phosphorous) is too low in SM specificed oils for the needs of your 4.0l engine. Link to comment Share on other sites More sharing options...
kro10000 Posted October 4, 2009 Share Posted October 4, 2009 yeah redline mtr in the trans, dexron III in the t case... i run rotella 15w40 (diesel oil) in the motor. it contains the missing ZDDP additives like what was previously stated Link to comment Share on other sites More sharing options...
JeepinSoldier Posted October 4, 2009 Author Share Posted October 4, 2009 I use mostly Redline synthetics for my driveline. Royal Purple is really good stuff too. I would just change the fluid once with a good synthetic, I doubt using regular gear oil is going to do much of anything. If your transmission is acting up it is probably just showing it's age and 183k of wear. Might want to keep a rebuild in mind for the future. I use Redline MTL for all my jeep manual transmissions. Thanks for the responses! Think the transmission is worn even though the symptoms just started when the weather got cold? The trans shifts fine once it heats up and did before. Ill go straigt to the synthetic. Link to comment Share on other sites More sharing options...
JeepinSoldier Posted October 4, 2009 Author Share Posted October 4, 2009 yeah redline mtr in the trans, dexron III in the t case... i run rotella 15w40 (diesel oil) in the motor. it contains the missing ZDDP additives like what was previously stated We use the Rotella 15W40 in our 05 Ford Excursion Turbo Diesel because thats what the diesel guys recommended. Ill use that in the Manche too. Think its OK to use the Rotella 15-40 in all the vehicles including the 4.0 in the 05 Wrangler Unlimited? I also stick with the good Wix filters from NAPA. No Fram ever. Link to comment Share on other sites More sharing options...
CRF136N Posted October 4, 2009 Share Posted October 4, 2009 yeah redline mtr in the trans, dexron III in the t case... i run rotella 15w40 (diesel oil) in the motor. it contains the missing ZDDP additives like what was previously stated We use the Rotella 15W40 in our 05 Ford Excursion Turbo Diesel because thats what the diesel guys recommended. Ill use that in the Manche too. Think its OK to use the Rotella 15-40 in all the vehicles including the 4.0 in the 05 Wrangler Unlimited? I also stick with the good Wix filters from NAPA. No Fram ever. I run Rotella in everything I have owned, 2 wheels or four, new and old. Its great stuff. The only car I have had issues running it in is my 2008 4 cyl Subaru...cold engine startup it struggled a bit and fuel mileage dropped, but everything else I have run it in has been great. Fully agreed on the filters...although I personally am too cheap to buy the expensive filters, I do stay FAR away from Fram :thumbsup: -James Link to comment Share on other sites More sharing options...
kro10000 Posted October 4, 2009 Share Posted October 4, 2009 at oreillys we sell rotella 10w-30 as well. thats what id run in a newer motor. i run the 15w-40 in my 200k mj because its worn Link to comment Share on other sites More sharing options...
Pete M Posted October 4, 2009 Share Posted October 4, 2009 Chrysler's latest spec for older AX-15s is 10W30 motor oil. Feel free to use a full syn version of that. :thumbsup: Link to comment Share on other sites More sharing options...
wallisek Posted October 4, 2009 Share Posted October 4, 2009 I remember reading a technical thread somewhere a while back that had a response from a tech working for New Venture. He said a full synthetic 5w30 oil could be substitued for the NV-3550, the 5speed that came with newer wranglers and cherokees. Tried it once in our 2000 TJ when local stores ran out of redline and other M/T synthetics. Seemed to work just fine, didn't notice any difference in shifting or operation. Link to comment Share on other sites More sharing options...
reson46 Posted October 14, 2009 Share Posted October 14, 2009 i run rotella 15w40 (diesel oil) in the motor. it contains the missing ZDDP additives like what was previously stated Do the CJ-4 oils still contain the necessary additives or have they been removed? I know the CJ-4 specification removed a lot of the additives to prevent clogging the DPF. Willy Link to comment Share on other sites More sharing options...
kro10000 Posted October 14, 2009 Share Posted October 14, 2009 The only real reason to run rotella in a gas motor is if you have a flat tappet cam, like our jeeps. the reason they dropped the ZDDP was because newer engines didnt require it Link to comment Share on other sites More sharing options...
kro10000 Posted October 14, 2009 Share Posted October 14, 2009 I have read mixed reviews, a rumor i read somewhere mentioned one particular downside, that the additives meant for cleaning a diesel are so powerful they can cause a gasser to lose compression Link to comment Share on other sites More sharing options...
whowey Posted October 14, 2009 Share Posted October 14, 2009 i run rotella 15w40 (diesel oil) in the motor. it contains the missing ZDDP additives like what was previously stated Do the CJ-4 oils still contain the necessary additives or have they been removed? I know the CJ-4 specification removed a lot of the additives to prevent clogging the DPF. Willy At this moment.. the answer is maybe.... In an internal memo from last Janurary Shell had stated that Rotella would be reformulated to meet the newer "clean" diesel applications. Also they have stated that stricter enviromental standards would force all of their lubricant line to be reformulated. But there was no timeline as to when that would happen. And there has not been any message to their retailers as to a change. Link to comment Share on other sites More sharing options...
reson46 Posted October 15, 2009 Share Posted October 15, 2009 i run rotella 15w40 (diesel oil) in the motor. it contains the missing ZDDP additives like what was previously stated Do the CJ-4 oils still contain the necessary additives or have they been removed? I know the CJ-4 specification removed a lot of the additives to prevent clogging the DPF. Willy At this moment.. the answer is maybe.... In an internal memo from last Janurary Shell had stated that Rotella would be reformulated to meet the newer "clean" diesel applications. Also they have stated that stricter enviromental standards would force all of their lubricant line to be reformulated. But there was no timeline as to when that would happen. And there has not been any message to their retailers as to a change. Yes, this change has already been made. That is what the CJ-4 specification is, the reformulated standard for the new clean diesels with DPFs that use ULS diesel. They removed many of the additives that were beneficial to prior diesel engines to prevent clogging the DPFs. Now it is almost impossible to find any left over CI-4 oils. I had read quite a while back that Valvoline was supposed to produce their old CI-4 formula as their "Classic" oil, but I have yet to find anywhere that actually carries this if it even exists. I not sure that this answers my question. I was specifically wondering if the any of the additives they removed for the CJ-4 specification were what was beneficial to gas engines. Does anybody know if they removed the ZDDP additives for the CJ-4 specification? Willy Link to comment Share on other sites More sharing options...
whowey Posted October 16, 2009 Share Posted October 16, 2009 i run rotella 15w40 (diesel oil) in the motor. it contains the missing ZDDP additives like what was previously stated Do the CJ-4 oils still contain the necessary additives or have they been removed? I know the CJ-4 specification removed a lot of the additives to prevent clogging the DPF. Willy At this moment.. the answer is maybe.... In an internal memo from last Janurary Shell had stated that Rotella would be reformulated to meet the newer "clean" diesel applications. Also they have stated that stricter enviromental standards would force all of their lubricant line to be reformulated. But there was no timeline as to when that would happen. And there has not been any message to their retailers as to a change. Yes, this change has already been made. That is what the CJ-4 specification is, the reformulated standard for the new clean diesels with DPFs that use ULS diesel. They removed many of the additives that were beneficial to prior diesel engines to prevent clogging the DPFs. Now it is almost impossible to find any left over CI-4 oils. I had read quite a while back that Valvoline was supposed to produce their old CI-4 formula as their "Classic" oil, but I have yet to find anywhere that actually carries this if it even exists. I not sure that this answers my question. I was specifically wondering if the any of the additives they removed for the CJ-4 specification were what was beneficial to gas engines. Does anybody know if they removed the ZDDP additives for the CJ-4 specification? Willy The two main differences in the certification documents I could find were that CJ-4 oils have a maximum limit of 400 ppm of sulfur and 1200 ppm of phosphorous, where the CI-4 oils were allowed 500 ppm of sulfur and 1400ppm of phosphorous. This would stand to reason as these are the two elements most associated with the clogging of the converters in gasoline engines. I would think the same would happen with the new DPFs. *edited my typo.. makes HUGE difference* Link to comment Share on other sites More sharing options...
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