hello to all 🙂 

mine is 2019 mk8 fiesta ecoboost 100ps automatic, current mileage is about 15k miles.

as mentioned earlier in another post, I'm waiting for a new short block under warranty because of a piston ring failure on the old one.

now about the breaking in procedure, we all know what the manual say about it : don't go high revs, vary your load, don't labor the engine.

but searching through the internet you can find conflicting opinion about this , this one for example http://www.mototuneusa.com/break_in_secrets.htm 

this  guy recommends heavy load ( large throttle openings ) specially during the first 20 miles, his assumption is that newly factory honed cylinders have edges from the honing process, and you want piston rings to seal well against cylinder walls by the time those edges wear, and to seal rings well you need high pressure so that gases get behind the piston rings and seal them perfectly against cylinder walls, he also states that not doing so can result in a not 100 % seal against cylinder walls, reduced power, high oil consumption for the rest of your engine life.

he also supports his assumption with photos taken of different pistons taken out of engines after the break in period and how clean the pistons are and how the rings seated well in pistons of engines broken in his way vs the owner's manual way !!!

I'm confused , I need help from you guys, specially those who have made long trouble free miles with zero oil consumption how they broke in their engine 🙂 

excuse my English if its not perfect, after all I'm Egyptian and its not my main language 🙂 

thank you for considering 🙂 

also another thing , breaking in a new short block is it the same as breaking in a new engine in a new car ?!!

I think your English is excellent, Ahmed, particularly as we are talking mainly technical matters on here!😃

Every time a similar question is asked, there is a wide range of opinions, as you suggest.

For what it's worth, I have always followed the running-instructions on a new engine. Unlike years ago, when you were told not to exceed 30mph for 1,000 miles  or similar, nowadays it's very much a matter of driving normally as long as you are a reasonably sympathetic driver. I've always felt it was perhaps more important to avoid labouring the engine at low revs under high load, than the odd short burst of high revs.

I would tend to treat a short engine similarly to a new complete one.

 

I've always run in new engines very carefully.   Years ago I bought a new Granada Scorpio 4x4 and ran it in over a period of 5000 miles.   I parted with it at 170,000 miles + and it never used a drop of oil.

The article may or may not be right. If I had read it in a serious engineering publication and it had been peer reviewed then I would pay some attention to it, otherwise it is just one one persons opinion.

I'm 100% sure that my Fiesta wasn't ran in like you describe there. Still it doesn't use any oil and engine works like it should. Now driven 116 000 km (72 000 miles).

thanks to all of you guys 🙂 , so I think I will stick to the manual, " avoid driving too fast for the first 1000 miles, vary your speed frequently ( I think they mean technically the load on engine) and change up through gears early, don't labour the engine ". thanks for the help 🙂 

On 7/19/2020 at 1:40 PM, Eng_Ahmad1986 said:

hello to all 🙂 

mine is 2019 mk8 fiesta ecoboost 100ps automatic, current mileage is about 15k miles.

as mentioned earlier in another post, I'm waiting for a new short block under warranty because of a piston ring failure on the old one.

now about the breaking in procedure, we all know what the manual say about it : don't go high revs, vary your load, don't labor the engine.

but searching through the internet you can find conflicting opinion about this , this one for example http://www.mototuneusa.com/break_in_secrets.htm 

this  guy recommends heavy load ( large throttle openings ) specially during the first 20 miles, his assumption is that newly factory honed cylinders have edges from the honing process, and you want piston rings to seal well against cylinder walls by the time those edges wear, and to seal rings well you need high pressure so that gases get behind the piston rings and seal them perfectly against cylinder walls, he also states that not doing so can result in a not 100 % seal against cylinder walls, reduced power, high oil consumption for the rest of your engine life.

he also supports his assumption with photos taken of different pistons taken out of engines after the break in period and how clean the pistons are and how the rings seated well in pistons of engines broken in his way vs the owner's manual way !!!

I'm confused , I need help from you guys, specially those who have made long trouble free miles with zero oil consumption how they broke in their engine 🙂 

excuse my English if its not perfect, after all I'm Egyptian and its not my main language 🙂 

thank you for considering 🙂 

My engine was broken in by the dealer as they drove it down to me somewhat 200 miles cruise on the M1 after that I never took it to the redline until around 500 miles. I remaped mine at 2000 miles (stage 1)  then again at 48000 miles (stage 3)  I am now on 60000 miles and my car uses very little oil dont think I have ever topped it up between services 12k intervals. 

I once worked with a guy that built race engines and his opinion on breaking in was to get the car on the motorway stick it in top gear and very the speed between 50 and 70 mph like what you have mentioned in your post it only takes 20 to 50 miles.

In regards to modern engine manufacturing they are built to much higher standards to say 20 years ago and some say you dont need to run a new engine in. This is aparrent as cars dont come with running in oil from the factory anymore. Just to add the only part of the engine that benifts from running in is the piston ring to bore all other parts are clearenced to go from the factory.

update : I was at the dealer yesterday, they told me that just after new short block installation, they will start the car and et it idle for about three hours for the initial run in , after that I was advised to follow the owners manual for the engine breaking in procedure for about 1k miles and then get back to them for final inspection...

now I've read various articles on the net that strongly advise against idle run in for long period of time, because of the lack of sufficient oil lubrication at idle, which will create uneven cylinder wall wear on a new short block, and this would greatly reduce Engine life, beside the possible negative effect on the turbocharger life span, that's what they say !!

now if anybody knows that if this initial run procedure by extended idle is mentioned in ford's service manual or not, so I can raise the issue with them, I want to get the most of this new short block life, any opinions ?

thanks a lot for considering guys 🙂