Effects of "high mileage" oils...

Joined
Jun 22, 2008
Messages
282
Location
Central Valley, CA
Anyone know how long the effects of "high mileage" oils tend to last? For example, if a "high mileage" oil decresed oil loss by 75%, will that effect continue after switching to another oil in a similar viscosity? Or will I have to continue HM oil use to keep the seals "conditioned"? Specific car is a 240k+ '97 MB with inline-6...always run on Mobil 1. After switching from 15w50 to 10w40 HM, oil drips decreased from 2-3 drops per night to 1 drop every few nights. Would switching back to 15w50 increase oil seepage to what it was before, or would it likely remain as it is on the HM oil?
 
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