I've read that the Amsoil Series 3000 5W-30 HDD is one of the best synthetic oil out there, even for gas engines. Are there any drawbacks or benefits of using the Amsoil HDD in a Honda Prelude over any other oil? Does it protect better at higher engine speeds (8,000 RPM)? Currently I'm using Amsoil 5W-30 synthetic and I have no problems with it, but I'd like to get some expert opinions on this matter. Thank you.