I'm a bit ticked off right now. I have 1,000 miles on Redline and I've already used over 1/2qt of make up oil!! RL has a NOAK of 5% so it's not the volatility. I've run Rx and it did Zero for my consumption problem. This car seems to burn oil at high speeds regardless of the oil I use. For some odd reason M1 10w-30 and Amsoil S2k did the best. M1 0w-30 was the worst. Does anyone have an explanation for this? I'm beginning to think I need a thicker and low volatile oil like Amsoil 10w-40 at this point. I have a lot of miles on the car and it might be getting to the point where I have to use a heavier oil. Could it be from switching brands??