I previously owned E90 325i and after that, an E92 325i which both has the same engine (and both blacktop), they were surprisingly cheap to fix and maintain. Two of the most common problem with N52 is valve cover seals and oil filter housing seal. During my 3 years ownership of my E90 towards 150k, I replaced both for less than $1000 at an European workshop, and a worn rear tyre due to single pegger skids, as well as regular servicing. On my E92 that I owned for 2 years, I only had to replace the valve cover seals.
Great engine and sounds so sweet, I would be keeping my E90 forever if it wasn't f**ked head on by a reckless driver.
It's best to buy a manual one even though the K's might be higher but doesn't matter as long as its in good condition and well serviced, in fact 200k is just the break in period 😂
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