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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Mechanical Maintenance and TSBs: Break-in / Oil & Fluids / Servicing / TSBs and Service Bulletin > Break-In: Highway vs. City Miles
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      03-27-2014, 05:28 PM   #1
TractionControlOff
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Break-In: Highway vs. City Miles

Since the manual states 1200 miles with no details, does anyone know if city/start-stop miles are more significant and should be the majority of those miles? For example, I doubt I could take a 1200 mile road trip that is almost all highway and have an effective break-in. I'm assuming that the components need varied speeds and RPMs, but I'm not an engineer so I really don't know. Any thoughts...? (Hoping to have my car in a week)
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      03-27-2014, 09:47 PM   #2
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moderation. Various speeds, various RPMs.
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      03-28-2014, 03:24 PM   #3
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Quote:
Originally Posted by TractionControlOff View Post
For example, I doubt I could take a 1200 mile road trip that is almost all highway and have an effective break-in.
False. Highway is the best break-in because it is not as strenuous in terms of start/stop, and fluids are at operating temperature for the entirety of the break-in.

City driving would mean much more time is spent getting to operating temperature and not be the better way to do it.

Varied engine load & rpm on the highway is as easy as adjusting your cruise control from 5 below the speed limit to 10 over and back down every so often, or whatever you're comfortable with.

I always recommend full throttle 3rd/4th gear runs up to near-redline without a gear change, followed immediately by zero-throttle deceleration back down to 3k rpm or below. This theory has served me well with 3 new engines so far in my experience in terms of oil consumption... knock on wood (2600 miles on the F30 now). The idea is high-load high-vacuum at operating temperature to help sealing surfaces get to where they need to be. I would do it with 10 miles on the clock if the car was fully warmed up by then. Realistically the major engine break-in occurs at the factory but I believe this helps.

Last edited by S4NoMore; 03-28-2014 at 03:30 PM..
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      03-28-2014, 09:42 PM   #4
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Quote:
Originally Posted by S4NoMore View Post
False. Highway is the best break-in because it is not as strenuous in terms of start/stop, and fluids are at operating temperature for the entirety of the break-in.

City driving would mean much more time is spent getting to operating temperature and not be the better way to do it.

Varied engine load & rpm on the highway is as easy as adjusting your cruise control from 5 below the speed limit to 10 over and back down every so often, or whatever you're comfortable with.

I always recommend full throttle 3rd/4th gear runs up to near-redline without a gear change, followed immediately by zero-throttle deceleration back down to 3k rpm or below. This theory has served me well with 3 new engines so far in my experience in terms of oil consumption... knock on wood (2600 miles on the F30 now). The idea is high-load high-vacuum at operating temperature to help sealing surfaces get to where they need to be. I would do it with 10 miles on the clock if the car was fully warmed up by then. Realistically the major engine break-in occurs at the factory but I believe this helps.
Well, even if I wanted to do this, I'm getting my first auto transmission this time. There is no way to prevent the shift on an auto is there??
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      03-29-2014, 02:02 AM   #5
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U can try to use the sport mode by shifting ur transmission to the left and start shifting by pushing it up for down-shift and down for up-shift. I just do my break in as what it says in the manual book, dont drive over 100mph and rpms below 4500 for gas engines, 3500 for diesel
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      03-29-2014, 02:42 PM   #6
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Quote:
Originally Posted by TractionControlOff View Post
Well, even if I wanted to do this, I'm getting my first auto transmission this time. There is no way to prevent the shift on an auto is there??
I think you can go into manual mode and reach to within 1k-1.5k rpm of redline before it changes gear.
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      03-02-2015, 10:01 PM   #7
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try to help utilize the sport mode via shifting ur transmission towards the left ALONG WITH labor and birth shifting through pushing That up regarding down-shift ALONG WITH down regarding up-shift. when i just do MY PERSONAL break inside Just as what This says on the guide book, dont drive in excess of 100mph IN ADDITION TO rpms below 4500 pertaining to gas engines, 3500 intended for diesel
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