Where is current list for GM4718M ?

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Originally Posted By: Eddie
Interesting that no 5w20 are listed


GM hasn't gotten on the gas mileage over engine protection train yet.
 
The Castrol EDGE bottles also have the GM4718M listing on the bottles as well, putting it in my buddy's "new" '92 vette tomorrow morning...UOA to come.
 
Originally Posted By: Eddie
Interesting that no 5w20 are listed


Thicker oil does just fine with in-block cams. Overhead cams seem to be the ones that a thinner oil works best with.
 
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