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At that mileage, it's 90% either crossover pipe or water pump--probably the latter.
It looks like there are three parts for the crossovers? Is it crucial to replace all of them at regular intervals? Or should you "definitely carry a spare of this one" for long trips?
Here’s my list for the SCV6 from a prior thread:
Parts List
LR090630 - Redesigned “water manifold” part of front crossover
LR092992 - Redesigned “water pipe” (Y-pipe) part of front crossover that goes into the block
(Snip)