I am a bit surprised that no one has started a thread on this, so here goes. Renault has accused MB of burning oil during qualifying or other times to increase the "fuel flow" and power. To get around the fuel flow limiter rules currently in place. Engine Oil consumption is not limited or regulated. So it must be some type of covert to the rules system that will allow engine oil to the combustion chambers. Of course MB denies all of this now. Anytime there is smoke, there could be fire, and I do think Renault would just make this up. But who knows? Not really a big fan of these power units, the expense and noise. I preferred the V12 and flat 12 era. MB has had the upper hand the past three years with their split turbo. But they are technically interesting science projects.