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Originally Posted by clickman
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The issue there is that the owner bought his car new back when Mobil 1's formulation was not the same as the formulation you see now. If memory serves, at some point mid-2000's there was change for the worse. Some experts in Excellence Magazine referred to these as "mass market oil that have seen decreasing levels of protective additives". Personally when I see an oil used in Porsches and Mercs being sold cheap at Wal-Mart back when the price of crude was shooting north fast, I have to wonder where they're cutting costs. Which is one reason I like the idea of oil analysis to see for instance how much ZDDP goes in and how much is still present on the way out.