I have 37K on mine (2001 Proton) and when I brought it to Isuzu for new rear shocks, they told me that I was still under warranty (also have an extended for down the road) but because I'm the 2nd owner, the powertrain warranty is void. I never heard of that. The extended plan I have covers the total vehicle so that's a gives a bit of comfort. Please let us know how you make out on the new engine.