Joined: Oct 2010
Location: Third Planet From The Sun
Oil separator, yes you need one
It's a no brainer Get a Oil separator and install it on the passenger side. you will not believe the amount of oil that would be passed along into the intake tract without having one. There are several choices on this web site. You do not have to spend a lot of money for a good one.
Also it will not cause any warranty issues as long as it is installed correctly. I have 45,000 miles on the clock and it's been in place since 1500 miles and I have been to the dealer at least 10 times and it has never been questioned.