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synthetic or regular 850

Hi Advisers,
My 94 850 non turbo wagon with 188K and rebuilt tranny is scheduled for a change oil. I have always been using Castrol but during my last oil service i tried to switch to syn blend Castrol. When I rebuilt the tranny i had the RMS changed to be sure. No leaks so far and looking good.
Would it be a good idea to switch to Full Synthetic Mobil 1 at this late stage? I just want to see if my gas consumption is gonna improve? Or stick with syn blend/ regular stuff.
Thanks for your vaulable inputs fellow bricks!






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