hmmmm...... ;

 

i know this is a dumb question but i just got to ask was it after the car died that you had no oil pressure,

the prob you had on the highway sounds like a bad cat, maybe bad fuel pump, but not an opti, and not any of these problems would not cause any of the other problems directly, either you got screwed or you just have really bad luck(like a million to 1 odds to have all those problems at one time), but either way you got screwed i guess

then again this is just all my opinion, and even though i drive a chevy, i am just a certified ford tech and chevy diagnosis is a whole defferent world to me

 

It looks as though the fuel tank was replaced. Did they say why?

 

The tank wasn't replaced. I think they meant they had to take it out and rinse it to get to the fuel pump.

I noticed zero oil pressure after the car stopped accelerating on the freeway and I pulled over.

 

Yep,me too.My car has done 10,000 miles ,with no problems ,since the waterpump leaked all over the opti,although that was nothing compared to the bath it got when I pulled the old pump off .

 

It's my understanding that if the opti goes bad, the misfires causes excess fuel in the exhaust and onto the honeycombs in the cat which restricts air flow and eventually with a strong burst of exhaust will bust it up.

 

excess fueling can and will ruin a Cat... but not right now. It takes thousands of miles of driving to do that.