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HI there,
The basis for older recommendations of engine oils have been completely rewritten.

If you consider all the information on synthetics, partial synthetics are still almost as good as full synthetics. Look at Dexos 5W30, its a partial synthetic and meets the GM lubrication specification 4718M.

That being said, there is NO substitute for using a full synthetic such as Mobil 1 or others. Full synthetics have no contaminants to burn and flow better when cold. So, either way you go, especially for the new Gen 5 LT1, Dexos or Mobil 1 will still serve you well and your engine wont be fully broken in for about 10,000 miles.

Allthebest, TCM
 
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