Hi. I have MB 350 S year 2006. I have a question about transmission (722.906). There is two types of solenoid valves. 4 piece with black cap and 4 piece with green cap. What is the difference between these two type of valves. Are valves with black cap on/off types, fast closing and opening? And is the one's with green cap adjustable type and slow moving? Am I right or complitely wrong. Thank you for your reply in advance.