RX-7_FC_DrIfteRI think it will take on the same effects that happend in GT3. The HP will just slowly drop as you use it more and more.
kenseiNot sure what the rate is, but it is much longer than GT3. In Gt3 it was like 200miles and you started getting the drop. In GT4 I have a car wth over 1500kph (over 900+miles) and I have no drop in power yet, my oil isn't even dirty.
It doesn't seem to be per car. Again it's like GT3 and just a standard drop.
Maybe it is different for the NTSC version of GT4, but I doubt it.