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Old 10-28-2011, 01:10 AM   #1
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Breaking in an engine?!?!

I am about to assemble my 4.6L 2V Mustang engine. My question is, How many miles are required on these engines until they are "broken in?" I was told that its 80k? But I would like to make sure.

And also, does anyone know where I can buy the main wire harness for this car? I cant find one anywhere.

Thanks and wish me luck
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Old 10-28-2011, 01:15 AM   #2
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Re: Breaking in an engine?!?!

I don't know where you got 80k from but a typical new engine is around 500-1000 miles.

Also, it is generally recommended not to use synthetic oil in a new engine, though you can find people that say they did it with no problems. I tend to lean towards better safe than sorry. I'd run regular oil in the new engine for 750-1000 miles and then change the oil to whatever oil you will be running in it for the life of the engine.

I am sure you will have plenty of opinions to sort through but 80k miles is not going to be close to one of them.
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Old 10-28-2011, 01:25 AM   #3
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Ok thanks for the info
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Old 10-28-2011, 01:29 AM   #4
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I've always herd 500-1500, and like Brent says synthetic oil is a no no during break in.
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Old 10-28-2011, 01:43 AM   #5
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I've always herd 500-1500, and like Brent says synthetic oil is a no no during break in.
Whats so different about synthetic oil?
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Old 10-28-2011, 01:48 AM   #6
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Re: Breaking in an engine?!?!

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Originally Posted by FORDGT14 View Post
Whats so different about synthetic oil?
It is thinner than traditional motor oil and more likely to leak through piston rings that have not been "broken in".
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Old 10-28-2011, 03:02 AM   #7
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Quote:
Originally Posted by Brent

It is thinner than traditional motor oil and more likely to leak through piston rings that have not been "broken in".
Oh ok, So synthetic is more for higher miles then
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Old 10-28-2011, 08:38 AM   #8
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Re: Breaking in an engine?!?!

seems many use break in oil on the first start up, let it run for a little bit then drain it, inspect for metal if you have any do it again.

then drive with oil (not sure if break in or just regular) for about 500-1000k then drain/inspect then you should be about good to go. Take it easy for the first oil change or two so everything gets set and you should be ready to go
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Old 10-28-2011, 10:05 AM   #9
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Re: Breaking in an engine?!?!

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Originally Posted by FORDGT14 View Post
Oh ok, So synthetic is more for higher miles then
As above. Not really high miles. You just want to make sure everything is set before putting synthetic in it. I have ran synthetic in my car since it had 2000 miles on it.
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