I have an 05 scion tc only 80k miles next thing you know it engine slight knocks at 3000rpms only 1st and 2nd gear then i change oil sounds fine for the first 15minutes then sounds like my gf banging on my door in the center of the engine ha. Drive it to mechanic noise is somewhat loud he says i need a new engine drive home then my rpms r screwing up not exceeding 2,000 in third gear and oil light is on and scrapping sound here and there. Should I just disconnect everything to engine if so should i be careful with hoses disconnecting certain ways or can I somehow rebuild it instead of paying 1800? HELPPPP