Mixing green and orange coolant?

[Rivernut]

Bought some green that states it can be mixed with any and all. Have the orange in my silverado and my wifes pt cruiser. Can someone like Airjer clarify this? Thanks a ton. Just needing to top off.

[Macgyver55]

For topping off it should be fine, but if the coolant in the vehicle is still fairly new, it might be better to use the proper kind. Without going into a long explanation of the makeup of coolant, universal coolants, while still properly providing freeze point protection, it may fall slightly short or possibly dilute the proper coolant of its original anti corrosion and lubricating qualities.

The main thing you dont want to do is mix the old style green with the orange extended life as it can cause a type of "coagulation" and form a substance that can really cause problems.

[Jeremy airjer W]

If it is clearly marked as "all makes all models" than it is not "green" coolant. it is likely more of a clear looking yellow tinted fluid. It will be fine in both of your vehicles.

Green coolant should not be mixed with any long life coolant.

[Rivernut]

Thanks guys, thats what I wanted to hear.

[Rivernut]

Its definitely green to me. But it says silicate and phosphate free.

[chad austin]

I don't remember the brand but I bought some coolant a while back that was green and was clearly marked that it could be used with any color coolant.

Thought I'd also that was about 2-3 months ago and I added it to my daughters car with orange coolant and there has been no issues.

[Macgyver55]

I think the Oreilly house brand universal is a light green color. In most cases universal coolant will be just fine. The main thing to watch out for is, while some universal coolants claim to be "compatible" with all types, does not mean they are "recommended" by the automaker or that it meets their individual specifications.

[Rivernut]

Funny you mention that. It is Oreilly brand.