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If you just bought it, take that POS back to where you bought it! Unless, you bought it from scumbags!
Personally I wouldn't do any work on the car and put it on them or else hire an attorney and sue the pants off of them!
Something might be burning off under the hood, make sure wires arent getting fried on the exhaust manifolds. Btw dont waste your money on 93 octane it does nothing for you unless your tuned on it.
should I be concerned with replacing the fluid/filter ect with it being 77k miles? one mechanic told me it may fall apart or start running crappy lol.
Not changing the transmission fluid at factory stated intervals is THE single most contributing factor to transmission failure. Don't listen to the mechanic, he doesn't have a clue.