Smart > G8 > Cadillac CTS. At least insofar as the first service cost goes.
Recently the CTS went over to Martin Cadillac for routine service; oil change, chassis lube, tire pressure, and fluids. The job took about two hours and the final cost was $0.00. Nice. Too bad the dealer's valet took 45-min to find and get the CTS back in my hands. You get what you pay for, right?
Mike Magrath, Vehicle Testing Assistant @ 14,888 miles

sodaguy says:
10:57 AM, 11/ 7/08
How was it $0?
mopar424 says:
01:10 PM, 11/ 7/08
you say smart >(greater than) G8 >(greater than) CTS?
dingo567 says:
01:12 PM, 11/ 7/08
The cost for service of the smart is > the G8 which is > the CTS.
karjunkie says:
02:15 PM, 11/ 7/08
Chassis lube?? First time I hear that in many a year!
hondacura4 says:
03:18 PM, 11/ 7/08
Since when did Cadillac offer maintenence free service?
hondacura4 says:
03:19 PM, 11/ 7/08
Since when did Cadillac offer free maintenence?
jsmilesrmhs says:
08:07 AM, 11/10/08
Did you get the Blinker fixed?
stingray454 says:
08:23 AM, 11/10/08
I don't know if it is a GM sponsored thing, but a lot of Cadillac dealerships offer the first maintenance service free of charge.