I intend to do a primitive experiment with this oil as soon as the weather breaks (probably mid March). I have a Chevy Cavalier (2002 with just under 20,000 miles) and will do the "magnetic oil drain plug" test because I am too cheap to do a UOA. Have noticed Amsoil 10W-30 after 7,000 miles will leave some fine shavings on the plug and I will use that as a baseline comparison to the Delo 400. I will also compare the gas mileage between the two oils. Seems like this is one of the best oils out there and if it does alright I will continue to use it. I'll probably do a 4,000 mile interval after the 7,000 mile test. I'll let ya know how it does!