Its was/is a known fact that bottled Mopar HDEO (diesel rated oil) was repackage Valvoline... the same oil recommended by Cummins. Not to mention that Mopar filters for the Cummins were/are rebadged Fleetguards.
Bulk oil at a dealer is whatever the local oil supplier sells and is cheapest... there is no dealer-required spec on the oil they purchase in bulk, as long as it meets the basic oil specification. If its a Pennzoil supplier, then you get Pennzoil; if its a Cam2 supplier, you get bulk Cam2.
You were talking diesel, not sure why you twisted the discussion around to gassers?
Bulk oil at a dealer is whatever the local oil supplier sells and is cheapest... there is no dealer-required spec on the oil they purchase in bulk, as long as it meets the basic oil specification. If its a Pennzoil supplier, then you get Pennzoil; if its a Cam2 supplier, you get bulk Cam2.
You were talking diesel, not sure why you twisted the discussion around to gassers?