I have an 2004 Mercury Mountaineer it has 207900 miles on it , this morning I was cruising on interstate at 75 mph I started up a hill and it would only go to 70mph I turned off the cruise and tried to push gas pedal it wouldn’t pull but to 50mph so I pulled off interstate and the suv cut off the check engine, high/low oil temp/battery lights and the message said check transmission , it wouldn’t crank up for about 10minutes, then I checked the oil because it was knocking I put 1 ½ qts oil in and now it’s running fine. I just had an oil change on 09/06/2010

It is possible that when you had an oilchange the oil used was 10/40 which is correct for this vehicle BUT i would advocate that a thicker oil is used for this mileage say 20/50.
all cars will use/burn oil and i always ask my customers how much oil they put in from the last service so that i can judge what oil to use.Thin oils (5/30)should only be used for new cars,and even then
keep an eye on oil usage/burn.....
We have all read,in various publications that "using the wrong oil can cause damage"but after 40 years in the trade,i have NEVER had a complaint or any engine damaged by this method of filling
at service.(we had forty bays in my last dealership.)