Why do you need one if you don't know how it works?
All it does is keep oil from the crankcase breather from going through your intake. It really isn't that important to have and I don't see how you are comparing it to a single setup?
You don't NEED a oil catch can!!!! If Toyota made the motor to vent like that then it is best to leave it how it was designed. Do you think they would design the motor to breath how it does just to make it not last? Leave it alone and it will be fine. I still have no idea how you think this would cause your 1JZ to defect and kill itself enough to make you want to go single. :wtf:
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