With a new radiator going in I'm finally going back to the Toyota Red coolant. The car came with green, and I would use the Prestone "safe for all models" green stuff to fill up / top off. I've read about the silicates in the green sticking to gaskets and stuff making the engine a little less happy, so would I be better off doing a chemical flush with 420cf or the like? Or just a regular flush with a few cycles of distilled water to clean all the old stuff out. I know either way is probably fine, but I'm trying to do everything proper.