Those who had NV5600 problems

[JohnnyH]

Although not wide spread, I've seen a few posts recently that involve NV5600 failures. Those who have had failures, what fluid were you running in the transmission. I know the options are basiclly OEM, Penzoil Synchromesh, Quaker State Synchromesh, Redline and maybe an amsoil product. My understanding is the First three are the same, just diffrent labels and prices. That leaves 3 choices. I know the latter 2 do not meet DC spec for the transmission, but some people like them.



I wonder if everyone who had failures were using the OEM lube. If so, why would one care if they were using one of the lubes that dont meet the spec. Chances are the failure is not going to occur before 70,000 miles anyway. I'm all for keeping the warranty in tact, but not at the cost of using an inferior lube.



I switched to Redline MTL at 15,000 miles, and just put Penzoil Synchromesh in today at 23000. I did not notice any change in shift habits between the OEM, Redline and now Penzoil. I basically got scared, and want to leave this in until I get good proof that the Redline is not going to damage the transmission. I'd be interested in hearing from some high mileage guys with the 6-speed and hear what they use.

 

[Hokey]

Although not wide spread, I've seen a few posts recently that involve NV5600 failures. Those who have had failures, what fluid were you running in the transmission. I know the options are basiclly OEM, Penzoil Synchromesh, Quaker State Synchromesh, Redline and maybe an amsoil product. My understanding is the First three are the same, just diffrent labels and prices. That leaves 3 choices. I know the latter 2 do not meet DC spec for the transmission, but some people like them.



I wonder if everyone who had failures were using the OEM lube. If so, why would one care if they were using one of the lubes that dont meet the spec. Chances are the failure is not going to occur before 70,000 miles anyway. I'm all for keeping the warranty in tact, but not at the cost of using an inferior lube.



I switched to Redline MTL at 15,000 miles, and just put Penzoil Synchromesh in today at 23000. I did not notice any change in shift habits between the OEM, Redline and now Penzoil. I basically got scared, and want to leave this in until I get good proof that the Redline is not going to damage the transmission. I'd be interested in hearing from some high mileage guys with the 6-speed and hear what they use.

Oil is a very controvrsial topic and I am reluctant to say this but, take it for whatever it is worth-I changed to royal purple syncromax in my NV5600 and shift quality significantly improved, felt like I had installed a good set of ball bearings- 2200 miles later still smooth. Plan to use oem stuff at next change and see what happens.

 

[LEPage]

Mine had been changed by the dealer about 10,000 mi before failure, with OEM. I guess my signature explains my failure. Now I have a trailer on order that is over a ton heavier. I was also guilty of lugging. The truck would pull strong from 50 mph in 6th, and I would step on the loud pedal and let it, trailer in tow. Lessons learned, I guess.