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I would guess somewhere around 300-400K, if engine is never overheated, and frequent 5-7.5K oil changes. Or, you could take a compression and leakdown every 150K to track it...Hi I have a 2012 lr4 5.0 just checking to see when I might need a valve job I'm doing timing chain right now. Anyone have a time line before valve job is needed. Thanks for any input