Almost 300K km on my 08 E92and it seems like it’s not enough. The drivetrain is bulletproof. I daily it and it never lets me down.

Don’t drain anything. Use only BMW coolant or blue coolant like Zerex G48.

Don’t blue yellow or green crap in.

I drive my 6 speed E92 in “sports” mode all the time and it’s holding up pretty well even at high mileage. Just change the oil often.

I’d only be worried if it was redlined and overrevved when cold. Did she drive it after it had been sitting for a while?

You’re right that it’s a bit low, but I know Euro shops can do an engine swap on a turbo BMW for around $2k. Can’t imagine an NA Mazda would be any more than that, probably less.

Or just pay $1k for a used engine another $1k for an independent shop to install it?