No man, I did a flush once, with the additive, no problem. Then about a year later, rad took a dirt nap- bad. Like an overheating Nova at a hot summer cruise night. Replaced, flush- no additive as it was new rad, new coolant etc. then a year later, there's that smell again. Took it back and got a new rad under part warranty, 13 months instead of 12, they let it slide. Now that one is cool and have flushed again since when my stat died. No additive there either. So, I've used the flush once and did not see any probs with it, just crappy rads. Hey, my dad went through 13 sets of rear drums and 11 fronts before his pulling went away. ABS problem if I remember, on his 94. Some have issues with just one thing constant. Wierd eh?