Here's the explanation from a few years ago:pgtr said:I believe the Ecotec in the Sol specs 5W30 meeting GM 6094M. No other SAE viscosities or API performance standards are referenced. What is special or unique about 6094M vs an oil meeting: SAE 5W30, API SM or ILSAC GF4?
pgtr said:So does anybody have a list of 6094 oils? Off hand I'd hazard a guess that Mobil, Texaco and Castrol offer something since they all have business relationships with GM and manufacture their various GM brand lubes.