I've asked this question before and never got an answer from someone who knows these transmissions. they are a 98 and 2000 e and ml 320s with 200,000 and no issues. Fuch has a newer 4134 fluid designed around the newer 7 speed which is just a hair thinner than the older 3353 designed for the 5 speed. these are 20 year old trans and I wondering if the 3353 is a better match than the newer 4134