Part of the job of engine oil is to suspend these contaminants within the oil until your next oil change. It’s a fairly daunting task for engine oil to suspend all the contaminants thrown at it; truth is that Pennzoil Platinum does a better job of preventing deposits on engine surfaces than conventional oil and synthetic blends can do. In fact, Pennzoil Platinum exceeds certain cleanliness standards that conventional and synthetic blends oils can’t meet*.
* Based on GM4718M and Honda HTO-06 tests using SAE 5W/30.