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I believe the high mileage oils have additives that are claimed by marketers to condition and swell the valve seals.
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Fixed it for you.
If oils marketed as "high mileage oils" had additives that could specifically target valve stem seals, and swell up hardened valve stem seals to restore their functioning, I wonder how those additives would know which seals were valve stem seals, and which other seals in the same engine would be worsened by swelling. What if the other seals were the right size, and swelling made them fail?
More claims by snake oil vendors.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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