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Well, a little of both. Also, climate plays into the decesion in my mind. If you live in the deep south where the engine will typically run hotter, then I would look to change the guide rails sooner. At 84,000 you Should be OK, but then again it is cheap insurance/peace of mind to change everything out.
Don't forget the oil line clips, they are known to fail w/ age as well.
Jonathan
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