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^^^^
Depends on the shop and their view on alignment.
Some shops will recommend an alignment any time the contact patch changes on the car from the previous setting. Some shops only recommend an alignment when gross suspension changes the angles.
Personally, I just go on where or not the car pulls and/or I start seeing abnormal tire wear. In fact, my 2002 Corolla has never seen an alignment since I bought the car late in 2001. Five sets of tires, three sets of wheels, new struts and performance springs installed. Some cars I've had couldn't go more than a year without something screwing with the alignment. A mix of being lucky and having a car that is forgiving of alignment mismatches.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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