Adam,



If you’re wanting a MS-9224 spec oil, to be able to write it legally on the bottle – the product would have to be an exact copy of the factory fill spec for the Chrysler MS-9224 product (MS= Material Specification which is used for factory fill specs). Since we do not compete nor make ‘me too’ equivalent products, always trying to make a better performing product, we cannot claim to be a factory fill version of the MS-9224.



What application (year make model) of vehicle do you have?




The RP Synchromax is our recommended product to be used as a replacement for the Chrysler MS-9224 but since we’re not a copy of that product, and the specification is a factory fill spec not a performance spec, to be able to claim and display that on the bottle of Synchromax is not possible.



The performance of the Synchromax is obtained through full synthetic base stock and additive package which provides better wear and high oil film strength…for improved metal to metal protection ….which is why we recommend it as our product for those applications calling out this specification.



Cheers,



David



David Canitz

Tech Services

Royal Purple Inc.


So technically does it meet spec? No. Is it better than the products that do meet spec? Quite possibly, seeing as its synthetic.

 

Very interesting... I am having problems with my clutch/trans. Basically once its warmed up any time i give it moderate throttle in any gear you can hear things banging around inside, sounds almost like an electrical arching... but its not electrical, it's metal on metal.

Ive taken it in 7, yes 7 times to remedy this... new motor mounts and u-joint and the problem is still not fixed. They say they don't hear anything and keep making me leave work (at my expense) to come and show them the noise, and then to bring it back "next week"

Anyways its still not fixed and im due to change the fluids out, just wondering if anyone who runs RP has had any problems with their warranty? I'm almost positive its something in the clutch, but it might be the output shaft or something...

Cheers

 

I was going to run Syn fluids but the Jeep Tech told me that he would rather look at the fluids more often for problems. Syn fluids tend to get changed less and are more $$.

 

While mildly related to the post, I thought I would share an added bonus to changing my diffs to synthetic. I changed the fluid for increased protection and overall logevity of the parts, since I plan on keeping the JK until it rust apart (which might be sooner than I had expected). Immediately after changing, I noticed a consistent, roughly 1+ mpg increase in gas mileage. I think it displayed more than that on the fancy electric gauge, but the old fashioned pen, paper (and calculator) method confirmed the improvement. I have since changed other fluids to synthetic, but have not seen the same dramatic difference.

The day after I changed the TC fluid, the JK went to the dealer for a tire rotation and any uncompleted recalls. They told me the fluid was long over due for changing. Guess their method of examining fluid is not very accurate.

 

I also run synthetics but extend the drain intervals on my oil changes for sure. It does come out to be less money. I am confident in doing this because I have the oil tested by an independent laboratory at 10,000 miles and at 15,000 mi (usually when I drain and refill). I have had no issues with either contaminants or Total Base Number (the measure of life left in the oil).

If you really want to know what you can do with oil, and not just guess... then get it tested. You can even use a "thief" to test without pulling the drain plug.

BTW - i use Amsoil and Blackstone Laboratory. Other oil companies may show the same results.

 

Got a question for you guys running the Mobil 1 Gear Lubes (both 75w-90 and 75w-140)...when you changed everything out, did you have to add any sort of additive for the limited slip/lockers? I know with some fluids you do, didn't know about the Mobil 1 stuff. I wanna change out my diff fluids ASAP in my Rubicon (just for my own peice of mind) but I dont wanna f*** anything up by not adding something else to the fluid if it needs it. Thanks~

 

Mobil 1 LS 75W-90 doesn't require any additional additives, at least for me. From their web site:

"Mobil 1 Synthetic Gear Lube LS 75W-90 contains special friction modifiers designed for limited slip-type differentials. In most applications, the addition of special LS (limited slip) additives is not required. For axles requiring the highest level of limited-slip performance, OEM specific LS additives can be added to this fluid."

h*ttp://www.mobiloil.com/USA-English/MotorOil/Other_Products/Mobil_1_Fully_Synthetic_Gear_Lube_75W-90LS.aspx

They make the same assertion for Mobil 1 LS 75W-140