Anxiously waiting for replies...
We've got the same engines (naturally aspirated) with a tad over 3,600 hours on each.
We've only put about 10 hours on em since we picked it up in November 2015.
I've been told they're good to at least 6 times that amount (20,000 hrs), but I'd rather hear from some other sources as well, especially seeing that Gabe n Em
mentioned 1/2 that amount.
By the way, we had both heat exchangers serviced before we took delivery.
I noticed one of the transmissions was running 40° warmer than the other on the sea trials.
Trans housing temps (used a pyrometer) were 100-105° on port, and 140-145° on starboard.
According to the shop, it was the heat exchanger, so for peace of mind we went ahead and had them both done.
Thanks for the suggestion on reading your thread.
Heading over there right now.
Here's a link for your enjoyment steveb