Don't even try to educate lil' Stevie- he knows everything already. Just sit back and laugh about the ruination of all of his vehicles that will occur from his own false beliefs.

 

Where does that come from? Per Honda's owner link site, coolant is MM 5 on the Fit and I don't see a 3-yr. recommendation except for brake fluid.

 

It's not a matter of corrosion happening, it's a matter of cost benefit. When you're "right" sometimes it's hard to understand this concept, and I speak from experience. Carry on.

 

What part of "as much" or "pitting" did you fail to read? Also Honda is pretty strict about stating to use their coolant to avoid corrosion/lubrication issues.

Of course, if you're Jay Leno and can afford anything for your 80 year old cars with no manufacturer's recommendations or proprietary maintenance products, carry on.