I had an 2001 740iL that I traded an old truck for. The electronics are kind of a nightmare, the water pump has a plastic impeller that likes to randomly explode and shoot plastic all through the cooling system. You can buy one with a metal impeller that solves this.
It ended up being the water pump seal. They replaced the water pump and thermostat free of charge.
Electric water pump on my BMW was \u00a3436.54 fitted at a BMW specialist (not dealership) OEM pump fitted, the same pump for me to buy and fit myself (no chance) was \u00a3600+ on Euro Car Parts
I paid similar for a BMW TBF, however, another garage told me that the garage I went to was known for charging high prices. I always shop around when the price is in the hundreds so I'm confident I wasn't ripped off.
I've owned my 2013 535i M Sport since 2018 with 44k miles. Other than the regular maintenance items... 2021- oil filter canister gasket replacement -$ 800 ( I think. I can't find the receipt) 2024- passenger valve cover gasket- $660 Driver's door handle replacement -$250 2025- water pump and thermostat- $1750
I had my 2008 BMW 135i E88 for going on 14 years, it's about to hit 70k miles and looks like new. I've done a couple bolt-ones (IC, charge pipe, Cobb tune). It's been a great car and a blast to drive. I did replace the water pump this past summer otherwise normal maintenance.
I’m on year 3 of a 2020 M240ix and it has cost me nothing besides regular maintenance and premium fuel. Now I expect that to change soonish, as at my last oil change I was told my water pump has a very slow leak and, at some point, will need to be replaced to the tune of $2k.
Buy the M340i new and prepay your services. Great on gas but insurances and tires have been expensive. Water pump blew at 48k.
A 525tds was my first car. Only ever had two problems with it. Heater fuse kept blowing- turned out the previous owners install of the head unit used eletrical tape which over time lead to a cable shorting out on the din cage. Water pump died - oem impeller was plastic. The replacement was metal
The cooling system is the major weak point (ask me how I know) - water pump failed before 70k (changed under warranty)
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