: 5 years or 100,000 miles?



chris203
11-03-04, 02:07 AM
Does the coolant on a Northstar need to be changed every five years regardless of mileage, or can you wait until 100,000. My '99 ETC is five years old now but only has 27,000 miles, so can I wait until 100,000 miles or change it now at 5 years? Thanks for your answers.

peteski
11-03-04, 04:21 AM
In this case they usually mean "whichever comes first".

Peteski :coolgleam

BeelzeBob
11-03-04, 11:19 AM
5 years or 100K WHICH EVER COMES FIRST.

You are due for a coolant change.

Time as well as mileage will deplete the corrosion inhibitor package in the coolant so that is why you need to get fresh stuff in there every 5 years or 100K whichever comes first.

This applies to the DexCool that started production in 1996. Prior to that the conventional green silicated coolant needed to be changed every 2-3 years/24-35K miles.

chris203
11-03-04, 06:27 PM
Gotcha. Whichever comes first. Ok, now I gotta find time for a coolant change and read up on how to do it. Thanks.

-Chris

Spyder
11-03-04, 11:18 PM
It's incredibly easy. Pop off the bottom radiator hose, the top hose, and flush it with pressurized air. Put the hoses back on, after adding BARS to the bottom one, and fill with 50/50.

chris203
11-04-04, 06:59 PM
Sounds simple enough. Have a couple questions though: 1. Will that new Prestone Yellow that already has the 50/50 mixture work? 2. How much coolant does it take to fill up the system?
Thanks
-Chris

BeelzeBob
11-04-04, 07:07 PM
I would not recommend it. That is not what the factory fill was.

Find and use Texaco DexCool coolant. Mix 50/50 with distilled water. There is really no point in spending extra money for premixed coolant. Buy the correct Texaco DexCool and mix it yourself with distilled water.