I have seen several reviews about Mobil Drive Clean Plus, but haven’t seen anything on it's “cleaning” ability. My question is, “ how close is it to Auto-Rx'?” Does anyone have any feed back on this oils’ cleaning ability for a high mileage car? (89 Honda 2.0L, 128K miles) Auto-Rx claims slow cleaning is the best. As such, would MDCP do the same job? I also belive that a thiner 5W-30 or 5W-20 would clean better than the 10W-30/40 oils. Would this be correct assumption?