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My check engine light came on right about the time I rolled 95,000 miles on my 2003 Impala with the 3.8L V6.  Does anyone know if this is a default setting to get me in for a 100,000 mile service?  I got a similar notice on my RAV4 for its first oil change so now I'm suspicious.  Any input is appreciated.  

yeah this is the default setting

used-auto-transmissions  

No It's not a "default setting" The car makers stopped doing that years ago. There's a maintenance light that will come on when the oil needs changing and rightfully so, but if the light says "Service Engine Soon" have it checked out.