If I recall correctly, either from this site or another, someone stated that Mobil re-formulated their synthetics to be "kinder" to gaskets, especially on older cars.

I also read that the synthetics do find any source of potential leakage, but then after several thousand miles actually help condition seals.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)