Break-in Process After Engine Replacement?

[JWaldz]

I've seen some people mention that they drained the oil they put in their swapped motor after running it a couple hundred miles. Is this necessary? Is there an oil fill/drain process after a newly swapped engine?

I'll be swapping out my motor soon and I don't want to go spending a lot of money on good oil just to turn around and drain it. I rather put the 'good stuff' in it when it's gonna be running with it for the normal mileage.

-J

 

[99problems]

I've seen some people mention that they drained the oil they put in their swapped motor after running it a couple hundred miles. Is this necessary? Is there an oil fill/drain process after a newly swapped engine?

I'll be swapping out my motor soon and I don't want to go spending a lot of money on good oil just to turn around and drain it. I rather put the 'good stuff' in it when it's gonna be running with it for the normal mileage.

-J

You want to use the break-in oil on a new engine because it has extra zinc that will help your various engine parts seat correctly without causing damage. Also yes, you typically want to run this for 50-100 miles at most and change it out with either more break-in oil or a conventional 5w-30 (no synthetic) and run that for another couple hundred miles. Change that out and refill with whatever you like (synthetic now okay) and run your normal intervals at that point.

 

[JWaldz]

You want to use the break-in oil on a new engine because it has extra zinc that will help your various engine parts seat correctly without causing damage. Also yes, you typically want to run this for 50-100 miles at most and change it out with either more break-in oil or a conventional 5w-30 (no synthetic) and run that for another couple hundred miles. Change that out and refill with whatever you like (synthetic now okay) and run your normal intervals at that point.

I can understand that on a new engine but would you do it on a used engine? The motor I got for the swap has 120k.

 

[Nate_GB]

I've seen some people mention that they drained the oil they put in their swapped motor after running it a couple hundred miles. Is this necessary? Is there an oil fill/drain process after a newly swapped engine?

I'll be swapping out my motor soon and I don't want to go spending a lot of money on good oil just to turn around and drain it. I rather put the 'good stuff' in it when it's gonna be running with it for the normal mileage.

-J

Is it a brand new or newly rebuilt engine? Or just a used engine that was swapped in? This will dictate the answer.

 

[Nate_GB]

I can understand that on a new engine but would you do it on a used engine? The motor I got for the swap has 120k.

No break in procedure needed unless you suspect some kind of contaminants in the engine from wherever it was sitting.

 

[csp]

Would you change the oil in the old engine, assuming nothing was wrong with it, after only a couple hundred miles?

Unless you suspect something catastrophically wrong with the replacement engine and want to check the oil for metal or bearing particles it makes zero sense to change it.

Make sure it has fresh oil at the install and follow whatever oil change schedule you would otherwise follow if a replacement had never been necessary.

 

[JWaldz]

No break in procedure needed unless you suspect some kind of contaminants in the engine from wherever it was sitting.

Ok, awesome. I just got the motor home, it's not even on the stand yet. I plan on cracking open the valve covers and dropping the pan to check oil.

 

[JWaldz]

Would you change the oil in the old engine, assuming nothing was wrong with it, after only a couple hundred miles?

Unless you suspect something catastrophically wrong with the replacement engine and want to check the oil for metal or bearing particles it makes zero sense to change it.

Make sure it has fresh oil at the install and follow whatever oil change schedule you would otherwise follow if a replacement had never been necessary.

I agree with this. I just questioned myself when I saw a couple people in different threads with used engine swaps replacing their oil after a couple hundred miles. Didn't make sense to me to do that with a used engine. Then I got to thinking, "well is there some kind of used swap engine break-in process I don't know about"? lol

 

[99problems]

I can understand that on a new engine but would you do it on a used engine? The motor I got for the swap has 120k.

Yeah in that case you're good. I thought you were talking about a new motor or a fresh rebuild. Swap that puppy and cruise on.

 

[Shuckatelli]

Im about to throw a new to me engine in. I went ahead and bought good oil and all that. If upon closer inspection I see something is suspect I might run cheaper oil through it for a second.
first 4runner and ive only had it for 2 weeks and it threw a rod. Lucky me!

 

[19963.4lsr5]

I heat cycled the engine I put in my 97 protect a few times looking for leaks. Then dumped the oil and put fresh oil and a new filter in.

It's worth keeping the old oil in the replacement engine for first fire so you can drain it hot.


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