how do you remove the whole 100% fluid? because when i took it in for a tranny service they only did the pan and torque converter. in your opinion is it easy to rebuild a 722.6 compared to the older ones?I respect everyones opinion. What you are looking for in fluids for your car is " the approvals" The Valvoline is approved for NAG1(Chrysler)=722.6. The NAG1 has the identical internal parts to 722.6xx, I rebuild transmissions. Just to lay down the the black and white answer. The Shell 134 it says it is Mercedes Spec for 722.6, but when the transmission rebuilders buy parts for a Chrysler NAG1 the transmission parts dealers do not refer to it as a NAG1, but a 722.6. Now a the same time, I would not use any Dexron III-Just the one(s) for NAG1 or 722.6 transmissions
Some will say the Mercedes and the shell stuff are Synthetic based; The Valvoline is not synthetic. Many members here have used the Valvoline for years without problems.
The dipstick tool, should be an important Mercedes tool to have. I use mine a lot. I have the factory one.
With what I read on these forums both fluids are fine for me.My E320 has Shell 134, My S320 will have Dexron III very shortly(I'm nearing my tranny rebuild), and My S500 has the Valvoline stuff in it as of last Friday.
My S500, Like I said, I exchanged ALL the fluid so I got nearly 100% of the old stuff with 100% of new stuff in. The oil pan and torque converter oil change will get you about 70% or so, and the pan oil only will get you around 40 something percent.
Hope this helps,