A recent question about leaving the oil cap off for a brief drive, he claims it helps clean the oil.“Very little oil is kicked out but the open vent allows volatile impurities in the oil to boil off and really cleans up, or keeps clean, the (full synthetic) oil”!A fire under the hood will also help keep dirt from building up on the engine. Makes, about as much sense, another concern would be containments entering the engine before the oil filter and causing problems. I do not recommend nor do I think it is necessary to remove containments from your oil with this method. Simply change it when necessary.