This is probably just marketing, but oddly enough the only Mobil 1 oils that mention cleaning within the PDS are the regular Mobil 1 line.
"keep your engine running like new by providing exceptional wear protection, cleaning power and overall performance". Never understood that but it's probably just marketing as I would assume they are all about that same in that area.
More specifically, M1 0w40:
"It provides exceptional cleaning power, wear protection and overall performance. Mobil 1 FS 0W-40 keeps your engine running like new in all driving conditions."
"keep your engine running like new by providing exceptional wear protection, cleaning power and overall performance". Never understood that but it's probably just marketing as I would assume they are all about that same in that area.
More specifically, M1 0w40:
"It provides exceptional cleaning power, wear protection and overall performance. Mobil 1 FS 0W-40 keeps your engine running like new in all driving conditions."