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by Sharky8js
Sun Feb 24, 2019 1:26 am
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Re: Synthetic vs Conventional Oil

I've heard, many years ago... once you use synthetic oil your not supposed to ever use conventional oil in that motor again.... In my work truck 2012 f350... I only use motorcraft synthetic oil, and the onboard computer says to change oil at aprox 7000-7200 miles... it has 149,000 on it so far Just ...