This test below is standardized,and compares Amsoil to Redline. I vote for Amsoil.
Don't even try and say the test was manipulated,it wasn't.
Amsoil would not be able to print or fake a test it if it wasn't true or manipulated..........certainly not year,after year. It would have been debunked by now.
http://www.enhancedsyntheticoi...d_Line_vs_AMSOIL.htm