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I've had some high-mileage 5.0's in the past that have used up a lot of oil. I was adding about a quart per week. I switched both of them (@ 100-125 thousand miles) to Valvoline High Mileage oil and they ran a lot better. You won't feel the difference, but those high-mileage oils have...

Well, I guess it was detonation. I ran Premium on the way home from Austin to Houston and it was immediately better. I had never heard detonation before and just assumed it would be louder. Any-who, it's better now. Thanks for all of the help.

I've got a mechanic here in Sugar Land (Southwest Houston area) that only works on Mustangs and does solid work. He says that he can install FRPP gears in about 2 hrs @ about $65/hr. Other gears (Richmond, etc.) are more of a PITA and take longer. You'll need to pick up a SpeedCal if you...

No, I don't hear it during idle or anytime I'm over 1,300 RPM. It just recently started about 500 miles ago. I'm using the 5w20 stated on the oil filler cap. It's a pretty loud rattle, and it only happens when in gear. Has anyone heard whether or not Ford will do anything about this...

Here's the deal. If I'm at low RPMs (~1,100) and I go from barely open throttle to nearly WOT, I hear a pretty loud rattle. I let someone else hear it and he said that it's probably "valve clatter" and that I should run higher octane. Now, I've also heard that these cars come from the factory...