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    Oil Recommendations and Discussion Thread for FAQ

    I started getting regular engine oil analysis done a few years ago and found slightly elevated lead levels. For years I had been using Mobil 1 5w-30, 10W-30 and sometimes 0W-30 when it turned cold. So I eventually switched to Mobil 1 5W-40 TDT and the lead levels went from a high of 17ppm down...
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