I hope I'm not flogging a dead horse here, but I'm interested in more opinions. I asked in the lifter noise topic, posted June 22, 2003 02:57 AM I have 18 litres of Syntec 5w50 left on my shelf that I would like to use up. How do those of you who don't approve of the use of 5w50 feel about me mixing my German Syntec 0w30 with the 5w50 to produce a 2.5w40-ish blend? Patman said, "Those two oils are so radically different that I don't think mixing them is a good idea". Anyone else have any thoughts?