Blue Thunder uses cheap synthetic oils in their fuel which is less protection. The only Blue thunder fuel I would use is the HP8 formula. Traxxas runs extremely hot on all my engines without good performance. Remember, oil burns hot (so a 16% fuel would run alot hotter than a 9% fuel) and nitro burns cool (20% hotter than 30%) so I like to urn 30/9 Byron blend. It runs amazingly cool (race tune is about 210 degrees) and has tons of power. So I say Byron gen2 is first, then Nitrotane is second like Barber said.