A number of years ago when MB put DPF's on their diesels and required the Mobil 1 ESP oils, dealers started using ESP oil in all oil changes. Their reasoning was the wrong oil wouldn't go into a diesel. The label on the oil said it could be used in both gas and diesel engines. Well the dealers started seeing gas engines sludging up on a regular basis. They notified MB. A lot of these vehicles were under warranty. MB of America went to Mobil about it. It turns out that the esp oils would not hold up with 10k oci's. They would sludge up the engine. Mobil came out with a bulletin not to use the esp oils in the gas engines. I realize that gas may have been different.
The reason I know about it is from my indy MB/BMW shop in Winchester, Va. The owner was a long time MB mechanic and warranty claim investigator for MB. They were one of the first shops to contact Mobil about it. Mobil sent 3 engineers to his shop to review all the records. This shop has always recommended 5k oil changes. But they were always getting new customers that had been serviced by dealers. The son has taken over and has gone to LM because he can get it cheaper.