Lube Stop Technician while doing his 20 point checklist on my Chrysler van on 3/11/08 stated that my license plate lights were burned out/not working and that my air intake system needs cleaning as there are heavy carbon deposits. The technician actually showed me a good deal of carbon deposit (looked like old grease from ball joint instead) smudge on a piece of paper.
I declined both the light replacement ($9.99) and the intake cleaning (I believe it was $64.99) as I was going to do it myself. Good thing I did it myself as the license plate bulbs WERE NOT burned out and as I cleaned the air intake system, I found very little dust/dirt deposit and absolutely "ZERO" carbon deposits within air intake system.
Beware to all that places/services like this exist all over this nation taking away your hard earned money when nothing is wrong.