I have some Nissan coolant left over from two years ago. I was wondering if it is still good to use the leftover coolant or should I buy a new jug of coolant?

 

It only degrades in your cooling system. You are safe to use it.

 

But its only good in your radiator for 2 years or so. You should get the coolant in your radiator pH tested and flush the cooling system if the piece of paper indicates the coolant in the rad is marginal or less.

 

This is brand new coolant that was left over when I did a flush two years ago. I used a 50/50 mix so I still have the jug half full.

 

Personally, I would buy a new jug of Toyota Red Coolant. After sitting for two years, your old coolant most likely has plenty of contaminants in it -- covered or not.

 

If the jug was capped all of that time, what would have gotten into it to cause the contamination?

 

I am sure that after the 50/50 mixture was made, at some point the extra coolant was exposed for some amount of time. I had the exact same thing happen when I flushed and filled with the Toyota Red about 2 months ago....just better to be safe and buy new.

 

my friend had a leak a few days ago on his 98' chevy tahoe, and when i checked it out it was red, so i figured it was tranny fluid but it didn't smell like tranny fluid. then he tells me that he uses red coolant. i was amazed. i thought there was only green coolant. whats the difference, cause my friend didnt know why. thanks

 

diff't color could just indicate different brands. like honda blue, nissan green, prestone green. peak is yellowy green.

what counts is doing ur rad flush at intervals and not waiting. i used honda blue, no over heat.. but the nissan green that i flushed out was REALLY green, and a radiator for an 8 year old car erally good.. inside no rust or corossion..

meanwhile my other accord which has a new radiator for about 6-7 years already shows signs of corossion using prestone, or no one knows brand..

 

this reminds me to flush out my coolant.. Been years.

 

My 2001 Chevy Tahoe's coolant is also red. Supposedly, it is a different type of coolant that lasts a very long time before it has to be changed for maintenance purposes. The owners manual even says that it doesn't require changing in an extended amount of time that I do not remember.

 

oh yeah? cool, thanks. btw, u know about tahoes? my friend has a very rare one.. a 98' police package, don't know if you heard about it. only 2,000 and some change were made before they were discontinued. made for police use, and my friend picked it up at a police auction. he has a rarer car then alot of these ferrari's driving around. and its a "tahoe"

 

i checked my coolent with the floating ball checker only 1 floated.

it said it was +20 so at 20 degrees my coolent is no good??

the motor seems to be running a little hot, its a 87 i should flush??

what mixture should i use?

 

Same w/ my '04 Jeep Grand Cherokee .. must be that long-life stuff Chrysler uses