Originally Posted By: TiredTrucker
I understand why some oils would not even bother with the "approved" dexos thing, and wonder why some GM vehicle owners lose sleep over the dexos thing, especially when GM kicks out stuff like their TSB 13-00-90-001 which states categorically the one can use any oil that meets GF-5. They don't say it that bluntly, but one does not have to read between the lines to see they are ok with it. From that bulletin, a snippet.....
If you are unable to locate a retailer, then a GF-5 Synthetic grade 0W20 oil that meets the dexos1™ specification, such as Mobil 1™ 0W-20 Advanced Fuel Economy synthetic oil can be used. It meets or exceeds International Lubricant Standardization and Approval Committee (ILSAC) GF-5 requirements.
This is why I have wasted no time worrying about the dexos1 thing.
So if you don't use a less expensive dexos blend, 'it's ok, just use a more expensive synthetic.' That is surely one way to keep customers hooked on dexos.