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I can't speak to the 4 year service life on the bearing, my guess would be protecting against the possibility of corrosion. If you do it yourself one the most key things to do is rotate the crankshaft manually to top dead center. Failure to do this leaves the cam lobes loaded by the valve springs making them want to rotate when the IMS bearing is loose. If the cams do rotate (i.e. the timing slips) the job becomes extremely complicated.
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2003 S manual
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