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  1. ChemRon

    Is synthetic oil this good???

    I have run a 1983 300D Mercedes, with a bypass filter to remove the soot. With 200 000 km (125000 mi) on a premium synthetic oil. Without the bypass, analysis shows I could run 25000 km without changing oil, but change the filter and add. With the bypass, went 110000 km (69000 mi) changing the...
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