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I want to replace the cooling water. So what cooling water is the best for a '90 Quad4? I read the owners manual and there are writen that the engine need the "GM Specification 1825-M". I was in a shop and searched a coolant water with the 1825-M number... but dont seen anything.

Where i can find the cooling water that my quad4 need  or what a company has that 1825-M specification cooling water?  

Regular green glycol, mixed 50/50 with water is just fine.

Don't use any of the exotic stuff, just a good brand name glycol.

You can even but it pre-mixed if that is easier for you, but it's a rip-off pricewise.

If you have Prestone there, that is what you want.

I use the green stuff mixed with distilled water in all my vehicles.
I found that everything with the "extended life" contains the OAT ingredient found in dex-cool nowadays.  I normally truck down to the local tractor equipment store and buy the green antifreeze/coolant from them.  I then mix it with some distilled water.  Usually a 70/30 mix (30 being the water) .  You can find non OAT laced coolant/antifreeze in certain auto part stores, but it takes some searching.

Okay, thank you guys