C Corvette Owner Joined Jan 22, 2003 Messages 1,676 Location Waldorf, Maryland Apr 20, 2009 #1 Where, on the internet, can you find the official, current list of oils that are GM 4718M approved?
P ProfPS Joined May 25, 2005 Messages 834 Location CT, YL of USSA aka Oceania Apr 20, 2009 #2 I think this one's the latest list: http://www.gm.com/corporate/responsibility/environment/maintenance/gm_approved_engine_oils.pdf
I think this one's the latest list: http://www.gm.com/corporate/responsibility/environment/maintenance/gm_approved_engine_oils.pdf
E Eddie Joined Dec 7, 2003 Messages 12,337 Location Florida, Cape Coral Apr 20, 2009 #4 Interesting that no 5w20 are listed
S SilverC6 Joined Oct 3, 2008 Messages 2,919 Location Southeast Apr 20, 2009 #5 Originally Posted By: Eddie Interesting that no 5w20 are listed GM hasn't gotten on the gas mileage over engine protection train yet.
Originally Posted By: Eddie Interesting that no 5w20 are listed GM hasn't gotten on the gas mileage over engine protection train yet.
F FrankN4 Joined Apr 18, 2008 Messages 1,093 Location Kentucky Apr 20, 2009 #6 Valvoline Synpower is now on that list.
S Solo2driver Joined Jul 6, 2004 Messages 1,385 Location Houston, TX Apr 21, 2009 #7 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.
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.
C chevrofreak Joined Jun 17, 2005 Messages 4,942 Location Billings, MT Apr 21, 2009 #8 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.
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.