Originally Posted By: 21Rouge
But the confusion lies with the fact that the Esso technical rep. I spoke to claims that the XD 0W30 with the CJ-4 designation necessarily means that it is also SM rated even though it does *not* show SM on the bottle
. Has any fellow Canadian seen an XD SM bottle?
I can't say I have seen such a bottle, but I haven't looked either. The tech rep is clearly mistaken. CJ-4 and SM often appear on the same bottle, but they are certainly not the same, and CJ-4 doesn't mean SM. Perhaps the tech rep should take a look a their Delvac 1 SHC. The sheet for that product specifically prohibits its use in gasoline vehicles, yet it is a C rated diesel engine oil.
Other companies also have diesel engine oils that do not meet gasoline engine specifications. They're not that common, but they are out there.
The tech should also take a look at Delvac 1300, which is both CJ-4 and SM and marked as such, and sold by their distributors for at least a couple years already. Perhaps he can find us some documentation from the API that shows us the SM and CJ-4 are the same thing. Maybe he could even get a promotion if he reports higher up that Exxon Mobil no longer needs to bother with both certifications, since one is enough.