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Hey guys, I've got 2 cars (Mazda6 and Ford Focus) with emissions tests that are due this month. I ran Techron through both last month (at least 2 gas tanks ago) which greatly smoothed things out on the Focus. I am also planning on changing the oils before the tests and was going to add half a...

Hey folks...wonderful, informative site that you guys got here. Let me preface by saying that I am a complete newbie on personal car maintenance so excuse my ignorance. I have a 2001 Ford Focus (Zetec Engine) w/ ~106K miles - it's a daily driver with majority coming on the highway. Oil changes...