Blade,
No, the "check engine" light shouldn't come on everytime you change oil, unless the code is telling you that your low on oil. YES, you have to disconnect the one side of the battery to reset the light, preferably the negative side.
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 ...just CREWZIN along! ® . . . PT Cruiser Links Moderator 
2000 PT. Original Owner, 110,000 miles
MY technical suggestions are given in GOOD FAITH without total guarantee, if in doubt go to a Garage.
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