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Brian - I would never use Mobil 1 in my shark. Tried it once too, and it leaked out in spots in an otherwise leak free car. It is too thin, even at the 20W50 weight. Just awful for our cars.
I now use Royal Purple, but there are many other good choices out there too. Does NOT have to be synthetic; just have good zinc properties (ZDDP).
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Ed
85 928 5 spd (guards red over tan)
07 Shelby GT500 6 spd (torch red over two tone black and red leather)
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