11/22/2023 0 Comments 6.7 cummins redline![]() If you are overheating the fluid, then step up a grade or 2, or use a fluid cooler, or both.ĭon't compare fluid experience with an 'old truck'. I doubt that ANY fluid will make up for parts breakage from too much HP/torque or driver abuse/foolishness. Your lifetime definition might just be a little more demanding then the automakers marketing.Įasy enough to upgrade to a thicker GL4/synchromesh fluid if you think you need it. If they determined that ATF would last a 'lifetime', then there would be nothing wrong with it. ![]() Lubricant choice takes weight, driving style, interval, usage, cooling(even simple vehicle airflow). I won't say that Mopar screwed the pooch. So there are fluids I have mentioned above ranging in viscosity from 9.5 to 14.0 cSt. It gave the best shifting feel of any fluid I ever ran in the NV4500.Īnd then there is AMSoil MTG, which I ran in the old Dodge because of the higher viscosity. I have experience with MT85 on my old truck. I e-mailed a question on the Contact page, and got a reply from Dave at Redline. 27% higher viscosity is a significant step up from C+4. I looked on Redline's site, and they have the High Temp ATF, at 9.5 cSt. I want something with higher viscosity, but if I want to respect the Chrysler recommendation, I could find a higher viscosity ATF. Now we're heading into hot weather, and it's time for a fluid change. Some equivalents from other oil companies are available that claim to be replica fluids (of the SHC, not the DC version). ![]() Mobil Trans SHC DC is no longer available. There never is a resolved outcome of any of the discussions. I have read a lot of stuff on the Interweb including some lengthy and colorful threads on BITOG that showed up in Google searches. There was a wide gulf of viscosity between the Mobil fluid, at 15.7 cSt, and the Chrysler C+4, which was 7.5 cSt. In my opinion, Chrysler really screwed the pooch by recommending ATF in the G56, when in medium duty European trucks, Mobil Trans SHC 50 DC was recommended. I have been running AMSoil ATF, which is what they recommend for the application. Once again, the age-old quandary of what lube to put in the G56 6-speed manual trans in the Dodge Ram diesel.
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