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oil change interval

16913 Views 22 Replies 13 Participants Last post by  Aussie
The manual says 7500 miles is this in spec with the info center that counts our percentage left
Does everybody change oil at this recommended mileage or have they gone further with oil analysis.
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Many have exceed that interval in the CTD, using higher grade oils than GM's dexos2 oil. Here is an oil analysis of the CTD using AMSOIL's 5W-30 low-saps oil as the first, and Total Quartz Ineo MC3 for the remaining samples.
 

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There are exceptions, but they aren't that common. I have a turbo instruction manual a friend sent me for a Subaru turbo that specifically states NOT to use Mobil 1 with this turbo as it has been demonstrated a cause of failure. Those cases, however, are few and far between.
 
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