Replaced coolant....still a bit below the full line.

If it was an inch below full when you drained I would wonder there is a leak. That would prompt me to fill to the full mark. Proper coolant is very inexpensive compared to engine rebuilding!

It's your turn to roll the dice.

 

I think it's less than an inch between the high and low marks on the engine coolant reservoir?

I'd cave, get another gallon and top it up, but I'm a bit OCD. It's not going to break the bank (my wife's favourite expression...), and you'll be able to use it eventually. Or if you never use it, just donate what's left to a Toyota dealership (though they may need to just recycle it, for security reasons).

Full disclosure: I've got near-full gallons of Toyota and Honda coolant.

 

put some cling wrap between the container & the lid; as long as it can't react with oxygen it should last quite a while /

 

It will degrade a lot more slowly in its original container than it would in an engine, assuming you put the cap back on.

 

maybe i don't understand the question, but if level is between low and high, it's normal and no corrective action needed, unless you are the OCD type.

 

Me too.
Then.....depending on where you live, it probably would be perfectly fine to add a few ounces of distilled water.
If you are anywhere near the Canadian border, then maybe not.

 

Caved in a few times myself. Both coolant tubs sits an half inch above the full mark. Long as this doesn’t hurt in any way, 10 out of 10 times I’ll fill over a bit Excluding crankcase. My philosophy is that the more volume there is, the less diluted it will be with contaminates.