Think in terms of dentistry:
You can never brush your teeth.
You can brush every three months.
You can brush every week.
You can brush every day.
You can brush after every meal.
There is always someone who never brushes their teeth and at the age of 70 still has avoided Gingivitis. Call that luck, genetics or a good Bourbon, but common sense would indicate that the more you brush the more likely you will be to still have them...It does not matter what brand of engine you have. Salt kills. Combine that with electrolysis and your engine will not see it's tenth birthday. Flush if at all possible, even if it takes effort