Ethylene Glycol does not go bad and lose it's freeze resistance. As Russ said the ph can get out of whack and turn it into a base or acid. Neither is good for your system. The most common problem is that the coolant loses its rust inhibitors over time. They are consumed.
You can add a quart of coolant rust preventative to the system rather than change it out.
__________________
Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
|