XJ40 ( XJ81 ) 1986 - 1994

Synthetic back to Conventional Oil

Old Oct 9, 2018 | 06:09 PM
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From: Metro Detroit
Default Synthetic back to Conventional Oil

I was told the prior owners used synthetic (Mobil One) but I have no proof. I would prefer to switch back to conventional and run 5w-40w (I live in metro Detroit). I searched old posts but didn't really find a clear answer or maybe there isn't one, just a matter of preference. Any current opinions?
 
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