2004 Ford Taurus: Just before leaving for vacation I had an oil change at a local lube stop. A few weeks ago after going for another oil change it was discovered that the wrong oil filter had been on the car the entire time. My car was running rough, shifting hard the entire 1200 mile trip and now it is slow to crank and indicates low oil pressure, but there is plenty of oil. If I add oil it does help, but I know I can't keep adding oil. What could be causing this? ( The battery is brand new)

Thanks, just added oil to see if it would make a difference. There was no logical reason why it would but it did. I have an appt with my mechanic tonight. It just makes no since, I can't think of what could be causing what appears to be a dry start. Yep, I have the old/wrong filter and am going after them to fix it. of course they are denying that it would have anything to do with it. Thanks, just added oil to see if it would make a difference. There was no logical reason why it would but it did. I have an appt with my mechanic tonight. It just makes no since, I can't think of what could be causing what appears to be a dry start. Yep, I have the old/wrong filter and am going after them to fix it. of course they are denying that it would have anything to do with it.

Have him check the oil pressure with a mecahnical gauge. that will tell him what he needs to know. If its too low, you may have internal engine damage. Have him check the oil pressure with a mecahnical gauge. that will tell him what he needs to know. If its too low, you may have internal engine damage.