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3rd Gen Engine and Drivetrain -> 2003-2007 5.9 liter Engine and drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

synthetic or regular oil ? how to tell ?

   
Old Sep 21, 2006 | 05:09 PM
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expressfish
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From: Adkins Texas
synthetic or regular oil ? how to tell ?
I just purchased an used 03 with 90,000 miles on it. I would like to change all the fluids and start fresh as I like to keep record of maint. How can I tell if the engine oil is regular oil or synthetic ?
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Old Sep 21, 2006 | 07:27 PM
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Hounddog
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From: Ila georgia
If you mean whats in it now or was used in the past.No clue.Don't know if even a oil analysis would tell you.Just use a 15w40 syn or dino oil that meets the specs of your choice.
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