You can use orange also, the old green coolant had a higher silica? silicon?
anyway a higher content that messed up aluminum if not changed regularly, it was dyed orange and works better with aluminum.
Orange is just as a dye so basically all the new stuff orange or green is fine as long as aluminum isn't in the heads, block or water pump.
Then you want to use orange or a low content green and change it more frequently.
Or don't believe me and google it to be sure, LOL.
But here's some info.
"The green antifreeze contains silicates, phosphates and / or borates as corrosion inhibitors to keep the solution alkaline. As long as the solution remains alkaline, corrosion is controlled and the system is protected. Over time, the corrosion inhibitors will be depleted and the corrosion protection is lost. It is for this reason that green antifreeze should be changed every two years or so. Aluminum is especially vulnerable to corrosion and many vehicles have heads, radiators and other aluminum components in the cooling system. If the coolant in an engine cooling system is changed before corrosion inhibitors reach dangerously low levels, corrosion damage is prevented.
An alternative to tradition green antifreeze is a product currently used by many engine manufacturers. "Orange" antifreeze is a long life or extended life type of antifreeze used to increase the useful life of engine coolant. It is ethylene glycol base as is the green antifreeze. The difference between the two colors is that orange antifreeze contains a different type of corrosion inhibitor that has a much longer service life than silicates, phosphates and borates. Orange antifreeze contains organic acids that protect engine parts from corrosion. Silicate (green) type antifreeze does not mix with orange type antifreeze. Never mix the two colors in a cooling system. The organic acids in orange types will cause precipitation of silicates in the green type and corrosion protection is greatly reduced. Orange type antifreezes are good for five years or 100,000/150,000 miles in newer vehicles (1996 and later). They can be used in many older vehicles (ask your vehicle dealer if it is safe to use orange antifreeze) if all of the green mixture is flushed from the system and is replaced with the orange mixture. Useful life is about four years or 60,000 miles in older cars."
ate the intake gaskets out of both, and i had to put 3 water pumps on my truck, 1 radiator, and i've put 2 water pumps on the blazer, i cant even begin to count the number of thermostats i've put in both. you can't keep the rad. in the blazer from gettin clogged up with that brown 
