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If you're concerned about prolonging engine life then shift at 2.3k rpm's always. Last I heard however, when an engine is tested for any kind of durability, they (the auto manufacterer) runs it at or close to redline for something like 30 hours straight. I could be way off on this but I think it's somewhere in the ballpark.
You're engine will outlast you and whatever you choose to shift at so long as you are maintaining it properly.
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