JohnH wrote:

I've got an I/O Mercruiser 5.7L, and it gets flushed *every* time it
gets taken out of the salt water, which is after each use.

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Thanks. Based on what you say and also being on the safe side,
we're going to flush every time also. The wife is going to check to
see if they have that set up for us at the marina.

Thanks again, Michael