Patman

I didn't change the coolant in my C5 until it was ten years old and had over 100k on it. I had no problems at all with the cooling system, and kept that car until it had 133k on it. I doubt I will push things that far in my C7, but it's nice to know that Dexcool really isn't as bad as many have made it out to be.

PobreWey

Most say 5 years but it lasts much longer. I'm with you though..., my c7 is a place holder until the c8 comes out so no way I'm having it that long.

robert miller

One more person that know it all correct. Unless you have used it to see what it does I really wouldn't say much. Just my 2 cents I know you don't give a crap..

JerryU

Thought this was going to start like a good friend (none Vette owner) who keeps cars 10 years and doesn't change coolent!

GM's recommendation good enough for me, I assume it is a conservative! However 5 years is about time for a new Vette! As it approaches I'm sure, God willing, it will be a C8 first!

VetteDrmr

Well, this thread has caused me to re-consider my maintenance. So, one more question:

What do yo do with the green "mix with everything" coolants? 2 years or 5 years?

Also, what about the manufacturer-only coolant, like the blue coolant in my Honda Accord? Just go with the owner's manual recommendation?

Have a good one,
Mike

RyanC7

I use the drain..fill...drain...fill method as well. Easy stuff.

cv67

If ownership is say 5 yrs or less dexcool and forget about it
Long term I flush all that stuff out (block too) and add green prestone

I dont know how the ends of the heater core are on the vette but every GM truck ive seen where it had old dexcool the plastic ends just fall off they get brittle and eaten up by that stuff.

Some of the flushing schedules imo are overkill...never flushed a ps in my life brake system only 2x

Patman

With my 2006 Honda Civic, because it's so easy to drain and refill the rad, I do that about once every 2-3 years.