I've got the red Toyota antifreeze in my radiator.
I got one of those Toyota coupon books, and they're advertising "Genuine Toyota Antifreeze/Coolant" that "does not contain silicates that may harm water pump seals". I was about to get some, at $16 (per gallon, I think the volume is) then I remembered I have some Prestone antifreeze, pre-mixed with water (50/50; I'm lazy that way) that says it can be mixed with *any* color of antifreeze.
Has anyone had any real-world experience with the Prestone antifreeze, vs. the Genuine Toyota antifreeze? Is it really possible to mix these two with no adverse effects?
I didn't notice any silicates in the "ingredients" section of the Prestone antifreeze - are silicates really a problem with the water pump seals?