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2.5s and 3.2s are perfectly reliable. However, I have heard that 2.7s and 3.4s (996) are less reliable because they are bored out versions of the 2.5 and 3.2 with thinner cylinder walls. The best overall 986 is a 2000 3.2 S. It still has the earlier IMS which is less likely to fail, and the reliable and more powerful 3.2 engine.
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