It's good to hear some "I did this and this is what happened" experience to balance out some of the "I heard this from someone who heard it from..."
I did use Mobil One in its early days in a 1972 Pinto with fairly low miles. Within 2,000 miles the rear main oil seal failed, the oil leaked out, and it cost a clutch, new seals, a camshaft, and a set of cam followers.
Many people believed the esthers in Mobil One could cause natural rubber oil seals to swell and fail, but I don't know that Mobil ever admitted that. However, the mid-70s probably saw the last of natural rubber oil seal production and by the mid-80s virtually all seals were synthetic and compatible with the synthetics and synthetic blends.
Without proof of seal replacement I'd be reluctant to switch an engine the age of Marin's, but not a later one.
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