Redline, Mobil, Lucas....... It really does not matter. Just not some off brand. I've run HD, Amsoil and Mobil. No discernible difference in heat, noise, performance or fuel mileage. It aint rocket science. Pick a good name brand and get it on sale. Run a good filter also. Again, not some Walmart or Dollar store stuff. Go to any forum and search oil. You'll find 100 different opinions about synthetic to dinosour oil and weights.