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On my 2003 Mach 1, the cap spec's 5W20. I did oil analysis on it when I bought it at 128,000 miles. It was a one owner meticulously cared for car that he used Ford spec's on for maintenance. I then switched it to 5W30 and have been running that over the past year. Oil analysis looks better with...

Thanks for the responses guys. I'm going to get the wife warmed up to the idea that we may have to let the dealership do the consumption testing for documentation to at least cover our bases.

My wife has a Jeep Cherokee with 2.4L engine and not quite 20,000 miles on the clock. Since new, the engine has burned oil at an alarming rate. At 3,000 miles or so, I checked the oil and it was a few quarts low. I had to add 2 quarts just to get it to show up on the stick, and another quart I...