Regular or Syn. oils
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Senior User
Joined: Jan 2008
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From: New Hampshire
Regular or Syn. oils
I have a 1998 Expedition (4.6) and I was wondering you can swap from reg oil to syn without doing any kind of harm. The whole reason why Im asking is that I have on this vehicle used reg oil but I won this oil package and its all syn oil. Thanks for who can give any advice.
Junior User
Joined: Jul 2005
Posts: 73
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You can switch from regular oil to syn at anytime will not harm the engine etc, however how many miles on the 98' 4.6 right now?? We switched a 93' 460 to syn that had a little oil leak that became worst with syn oil, why you ask?? Could be slicker or cleans the motor better.
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