It's not uncommon for a stock 5.0L engine to use 1/2 to 1 quart of oil between 3000 mile changes. Some use nearly no oil. I wouldn't lose sleep over it. The engine can still run fine for 200,000 miles. I think there are probably two reasons why some use a quart and some use none:
1) luck of the draw - a side effect of high volume production
2) how the engine was broken in - how well the rings seated
This is just an observation, I have no imperical data to back it up, but I have noticed that the factory 5.0L engines with forged pistons and low tension oil ring packages tend to use more oil than the hypereutectic piston engines of 1992 - 1995. Anyone else notice this?
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Craig
Supercharged 93 GT
"I drive way too fast to worry about cholesterol!"
Then I went to the doctor.... whoa 312! Hello Lipitor
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