As some of you know I switched from using 5w/10w-30 Mobil 1 TriSynthetic to the M1 0w40 SuperSyn. On the previous interval of 10,000km my car burned almost 4L of oil and this was through the winter months when I was not driving the car very hard. I switched to the 0w40 in the spring. I'm at 10,000km now and so far I have burned about 2L. Most of the usage came early in the interval and it seems to have stabilized for the last 3,000km where I haven't used any at all. I did one track day on this oil and of course since it's summer, I VTEC a lot more than in the winter. I will use the 0w40 for the next 10,000km and monitor the usage again. The improved usage could be attributed either to the higher 40w and better specs of the 0w40 over 10w30, mainly HTHS and NOACK. But it could also be because of the different formulations, TriSyn vs SuperSyn. Either way personally I'm satisfied with the 0w40 experiment and if my usage is even lower in the next interval, I'll be one happy customer. The weird thing is my 2nd L of top up on this interval was some old 10w30 TriSyn I had lying around.. Yet I still didn't burn any since then..