I've ran Shaeffers 5w30 with 15oz. Lube Gard Bio/Tech for the first two oil changes, every 5k miles. I plan on trying Redline 5w30 with 10oz. of Lube Gard Bio/Tech, at the next oil change. I'm wanting to compare the results of temps and valvetrain sounds. The engine is pretty quiet at them moment, even headers. I wonder if Redline is better than Shaeffers.