Just took delivery of a FE and truck driver already dented rear quarter

[SupraSizeMe]

I had the same thoughts about breakin, my trip was about 345 miles down Interstate 81, but was told that the B58 was already broke in and not to worry as some take these to the track on the first day. These are not like a vette which needs that breakin, the manual states to keep the RPM's under 4500 and the speed under 100 MPH for the first 1200 miles which I have accomplished. The manual says nothing about vary speed up and down like other cars I have owed which includes 2 vettes and a Mustang Cobra.

It's definitely a myth that engines like the B58 is broken in from factory. It's such a common engine used in SUVs and sedans that BMW isn't going to spend the time and money to break in every single one. It's also why there is a break in section in the owner's manual. Otherwise, it wouldn't matter. There's some pretty good resources out there regarding engine break in.





And the consensus between pretty much everything out there is to vary load and speed when the car is new and don't rev it too high or lug the engine. Savagegeese's video has interviews with engineers discussing this very point. The oil analysis in the other video is pretty good evidence that even a Corolla engine needs breaking in but it may not matter as much in a commuter car like that where drivers won't really stress it much by going on track or do any high performance driving. For a Supra, I do strongly believe that a proper break in is essential.

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[razorlab]

Break in instructions in the manual are mainly lawyer words to make sure things like brakes, etc are bed in well and that if anything were to fail that the car wouldn't be getting it's snot beat out of it at the time.

I haven't broken in any OEM engines in my life. In fact, they are usually tuned the same week I purchase them and on track the next. The only engines I have taken the steps of "breaking in" have been aftermarket built engines. Either on the dyno or the street.

I've datalogged and tuned literally thousands of cars at this point.

All that said, if "break in" makes you feel warm and fuzzy... why not.