Isn’t it interesting, as are most oil discussions, mine is better than yours blah blah blah. I didn’t start this to claim Amsoil is better because I use it, I‘ve shown proof it’s better based on test results. As of today, results showing Amsoil and Redline far exceed any and all Full synthetic and that for the price, per quart compared to the top of the line (not cheapest) Full Synthetic, Amsoil comes out on top especially beneficial if you do extended oil change intervals. I’m starting to hear great things about Amsoil XL line too, it’s an added boosted oil for a few dollars cheaper that’s proven to beat Mobil1’s annual protection too. I don’t make the oil or sell it, I just go by what I’m told by the manufacturer and what Blackstone Labs back’s Amsoils claims on engine protection. Grumpy, you ever think about mixing Amsoil Signature series with Redline? I think Redline is a dollar more than Amsoil? Sent from Above