If you already replaced the timing chain components, you shouldn't have to worry about that problem reoccurring, if your oil change intervals (and oil choice) are correct.Thanks guys. You have given me a lot to think about. My current thoughts are to abandon the idea of switching to the V6. I recently had the timing chain guides fixed and the coolant crossover pipes replaced plus a new coolant pump. I figure my V8 is worth $20k, to ‘upgrade’ to a 2016 V6 is going to be $40k or I could allocate the extra $20k for repairs on the V8.
If you are nervous, schedule the coolant crossover pipe (and possibly water pump) replacement every X miles, along with flushing/replacing the coolant every X years. I'm still very suspicious that the plastic pipe failures are related to the excessively long coolant change interval, 10 years / 150kmi:
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