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Not a fan of Seafoam for modern engines, and it is usually used in intakes, (very carefully, and atomized vs pouring in), vs oil sumps, where it calls for a oz or so, per quart, followed by a few hundred mile hot oil change.
Here are the ingredients from a post by JCL, and easily found on the Seafoam MSDS:
Those three petroleum products they reference are:
"1) light mineral oil (not a synthetic) of unknown properties
2) naptha, properties not specified, but something usually associated with lighter fluid and white camp stove fuel
3) rubbing alcohol
Three things I wouldn't put in a modern engine, especially when they displace the required synthetic lubricating oil. Hence my reluctance to use it. Also the reason that BMW specifically advise against using such additives."
If it were my car, I would do 2 short interval, back to back hot oil changes...
The 'color' of modern synthetic oil, after being in the car for a short time, is not the 'indicator' one would think.
Your car, from sitting so long and with unknown/seldom maintenance and previous oil changes, may have some sludge or internal buildup, but none of us can diagnose that from reading.
Your mechanic's advice is not bad/wrong, but maybe overstated, imo. Do a very hot oil/filter change, drive a few hundred miles, do another. It may alleviate your situ...
Not trying to start an arm wrestle on 'additives/cures', but there are no magic bullets, in my experience/reading.
GL, mD
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