Okay, I've done more than my fair share of Googling, scouring Pentosin's website, and BITOG searching. I literally have spent 3 hours in total. I can't find an answer. If I use Pentofrost A2 for my next coolant flush (around the end of the month @75K in my Elantra), what should my interval be/when should I change it next? And before anyone asks, I'm not needing a specific detailed analysis for my individual car, just assume no problems and normal service. I am clueless, and wouldn't know the difference if you say 30k or 150k. You would think Pentosin would be a little more willing to share when to buy their product again...