Michael (and the list), Sometimes anecdotal evidence, especially in large enough quantity, means more than technical data. I'm an ex-engineer, but I believe in instinct, too. So when an honest mechanic (how many of those are there?) shared with me his personal findings from 30+ years of working on all kinds of cars, I had to listen up. Lo and behold, it worked. And then I come to find through the IML that I'm only one of many who feel the same way about Autolites as mechanic Gene did, and now I do. Every automaker's engines have different characteristics, from those more common to the brand to those totally peculiar to the engine in a single car. The brand characteristics for Mopar engines seem to have a good compatibility with the brand characteristics of Autolite plugs. I have never taken the time to explore why. I just know I found a good, and real, solution to some common Mopar problems. If you read the technical specs to most engines, and even entire cars, from the 1950s and 60s, they all sound about the same on paper. So why do we choose Chrysler products? Because details run deep, and they work together to form something greater than the sum of the individual parts. A great orchestra might have no standout players, and all the world's best soloists might not make the best orchestra... or they might. All depends on the synergy. And in case you were wondering why I suspected you were personally offended, you did start your reply with "Bah humbug!" Sounded to me like you were having a pretty bad day, and I didn't want to think I caused it! :) Happy Imperialing, Chris -------Original Message------- From: Michael and Roger <tenpalms@xxxxxxx> Nothing in my post indicated any "personal offense". I just asked for technical, rather than anecdotal, reasons for the statement you made, "never, ever, ever, use Champions in a Mopar."