First off I got this message in my text window today while driving my '01 S60 T5 that said "ENGINE SYSTEM SERVICE URGENT" Anyone know what that means? I just got the oil changed about a week ago and topped off all of the fluids. It's not leaking oil anywhere and it runs great like it always has. What could be causing this message to appear? Also I am curious if an audible blow-off valve can be added to our cars(turbocharged ones)? I called the dealership asked them and they said it's not possible because the turbo is "electronic." So why would this make it so that a blow-off valve could be installed?