Quote:
Originally Posted by Joe240
I know what BMW recommends for breakin on new vehicles, and I did it on 3 of my 4 new BMWs in the past 3 years. But I did not follow breakin procedure on my z4 m40i. Only time will tell how it adversely affected things, but here's the breakdown so far:
'17 m240ix - needed new turbo at 1000 miles due to oil leak at return line from turbo. Followed breakin directions. drove it for 32k miles. Did oil change after first 1200 miles (because I drove it 200 miles with the minor oil leak before dealer could get me in. Oil change is part of the turbo replacement procedure), no diff changes.
'17 x1 xdrive - no mechanical issues at all in the 30k miles we drove it. no breakin oil change, first was at 10k miles. followed breakin directions
'19 x3 m40i - no mechanical issues so far. Had first oil change already (sitting just over 10k miles). Followed breakin directions.
'20 z4 m40i - no mechanical issues so far. Haven't done any oil changes or diff changes (sitting at 2k miles). Did not follow breakin directions and engine still runs smooth, trasmission is same as new, no ill affects so far.
Granted, the z4 got a 150 mile drive back home from the dealership through a downpour so it cruised between 50-80mph on the highway several times. around 250 miles I started doing some WOT runs because why not and have driven it hard ever since.
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Interesting and I hope it works out for you on the Z. I know a number of folks would say a break in period is not necessary (including my salesperson) . I plan on keeping the new m40i I just ordered a long time and I will follow BMW's break in recommendation. I had a 96 Z3 I purchased new for almost 20 years and very few problems. I broke it in per BMW's recommendation. It is my understanding that the break in period is important for longevity. I guess that would suggest that problems with not breaking it in properly might manifest themselves only as the vehicle ages.