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Thanks a lot for the itemized "to-do" list. I greatly appreciate it.

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...

Sorry to go off-topic, but can someone elaborate on the impact that these revelations have on the rest of the Mobil line? There use to be a clear distinction between M5000, M7500, M1, and M1 EP, but I am not so sure right now...sorry for the newbie question and thanks in advance.

Thanks again guys for the comments...definitely clarifies my train of thought.

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...