break in period?
break in period?
Senior User
Joined: Sep 2003
Posts: 212
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well i don't know about the new engines all that well. my brother has a 3.0 in his ranger that he bought new. i told him to change the oil after a 1000 miles and then again after 2000 and then at 3000 regularly after about 6000 we took it out and got on it. damn was it pukey, it's slow and has no torque but it gets good gas milage and is okay as far as high end goes. I don't think you will get the same answer from two people though, each person has their own ideas and their own rituals. I built a 302 for my truck and i gave it 6000 before I even tickled the 4 barrels.
Senior User
Joined: Aug 2003
Posts: 207
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From: Chicagoland
I would personally give it a couple thousand miles before opening her up.
Also change the oil every 500 miles for the first couple thousand miles. Manufacturing slag gets in the engine and can really damage the block and rings.
Also change the oil every 500 miles for the first couple thousand miles. Manufacturing slag gets in the engine and can really damage the block and rings.
Senior User
Joined: Aug 2004
Posts: 228
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From: Central Texas
Todays modern engines don't need a breakin period! The slickest, smoothest parts are used in them. Just turn it on and warm it up for 10 or 20 miles and then have your way with it. What is there to hurt? With the opinions I read here NASCAR would be running their engines for weeks before each race. When breakin periods were needed was when the rings were cast iron and the macheening was not neaarly as close as it is today. I have built many engines for myself and friends, none of them had much of a breakin period. These engines last as long as any other.
Big Jim
Big Jim
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Joined: Aug 2003
Posts: 207
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From: Chicagoland
It has nothing to do with the "smootheness" of the parts - it is about debris and metal shavings in the engine from the manufacturing process. There is always a little bit in there, and changing the oil a couple times right off the bat will clean it out.
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