Easiest way is to bring it into the dealer. They should tell you if there is a way to do it without an OBD-II reset. If you don't want to deal with the service shop, purchase an OBD-II reader for as low as $35,, just make sure it has rest capability. these also come in handy when you have a check engine light, you can make sure the service shops don't rip you off or you can do repairs yourself with the aid of a service manual.
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Your best longevity check is to set up and maintain a consistent oil and filter replacement schedule...Depending on your planned driving habits...your owners manual should recommend you change these every 5000-7500 miles or every 3 months whichever occurs first. Oil products have inproved for many years. The synthetic oil blends are the best for performance and mileage...most exceed your Cadillac specs...Mobil 1, and Castrol full synthetic are by preferences...No special tune-up or other maintenance should be needed at this time...watch for serpentine belt...100,000 miles...plugs and plug wires...100,000 miles...suspension parts vary between 75K to 100K before replacement...Hope this helps.
Most vehicles do not speak to percentage but to driven miles In your owners manual there is a page that has the manufacturer's recommended oil change schedule, and those pages generally say 2000-3000 miles on the first change, then 7500 there after. The percentage usage is a reminder that you are getting near the 2000-3000 mark, but this can be reset by a push of a button.
oil/filter/lube every 3,500 miles synthetic oils every 5,000 miles
tire rotation wheel align check balance every 7500 miles
transmission service every 30,000 miles
air filter gas filter cabin air filter evry 30,000 miles
if engine has a timing belt(rubber substance) replace every 60,000 miles if it has a metal timing chain lasts almost forever
spark plugs should be good for 75,000-100,000 miles before replacing
Spark plug wires every 50,000-60,000 miles approx.
fuel injector flush every 30-40,000 miles approx.
the maintenance light staying on means that you have passed your scheduled 7500 miles w/o an oil change etc... if you have just done the service, they should have reset it for you. on your particular model, up to the first 6000 miles the light will come on for around 2 seconds when the ignition is turned on, between 6000 and 7500 miles the same will happen, except after the ignition is on, the light flashes for 10 seconds. the third is what you have, a light that will not turn of after 7500 miles without service. to reset, with the ignition off, press and hold your reset button on the instrument panel and start your vehicle and keep the button held down for 10 seconds, it should turn off. I hope this takes care of it for you, Good Luck!
Change the filter with each oil change. Unless your towing, the tranny filter is usually 60k miles. Check your manual to be sure. Your manual should spell out when maintenance is to be done. If a garage wants you to do some outrageous expensive maintenance, have another garage look at it.