Ok I have a 2000 Lesabre with 75k on it...I was going to be proactive and chg the UIM before it burned thru...a tech at the local GM dealership said that my car has the reduced stove pipe and all late 99 and up do too...he said while this doesnt mean it wont be a problem 75k is too soon to worry..
Did they chg the stove pipe size ?? Any way to know for sure ??