[mike sevel]

'08 E93 approaching 100k miles with original water pump. Thinking of replacing it. Is Pierburg the safest option? Other options? Back to Pierburg, very pricey.
Any good deals out there??
Pls advise,
Thanx, Mikey

[lordnikon]

I'd just stick with Pierburg. Mishimoto also manufactures water pumps but I heard the pump runs at full speed all the time which defeats the purpose of an electric water pump.

[StradaRedlands]

AFAIK Pierburg is still the go-to. Pricey, but half the price of genuine!
And still made in Germany!

[lookalikehuuh]

I don't think 100K is any type of real milestone to replace the water pump on these cars. On my N52 car the water pump never actually failed, I did replace it at 180K miles when I got a code for the thermostat.

On my tuned N54 the water pump failed at 140K miles. I got codes for waterpump speed deviation a few weeks before it outright failed.

I would personally say that unless you are getting shadow codes for the pump, then I wouldn't necessarily pro-actively replace it. I would use that time to save up and get the pierburg unit, its solid and lasts a long time, why mess around with other junk parts? especially with something as critical as a water pump.

Ensure you replace the thermostat while you are in there replacing the water pump.

[Cloverdale]

A quick peruse of what's available indicates alternatives (many still using plastic) aren't much less in price compared to the all metal Pierburg. It's a job time consuming enough that you'll want to also confirm hose conditions. Pierburg boost solenoids are the only one's that are reliable which reflects brand quality. Those hose connections are challenging to get proper due to space limitations so be prepared.

[Efthreeoh]

My advice is scan the car with a BMW scan tool and look for the waterpump trouble codes. If you find no codes, leave the pump alone.

At 100,000, the coolant is due for replacement. With an '08, think about the Mickey Mouse flange. Easy to do with the coolant drained during replacement.

[GoRomeo]

Yew and No. If you are planning to use your car short trips here and there I would not worry about changing your water pump now.

But if you plan to use your car for long trips etc, for peace of mind I would replace it along with thermostat before leaves you stranded in the middle of nowhere.

My 2 cents. 🍻

[StradaRedlands]

Incoming anecdote: Our N55 E70's pump went out at 82k miles. When replacing it I found out it was a shit Amazon/Ali part the PO put in. Don't go cheap! But also the original one went out before 72k as that's what we bought it at.
Replaced with OE Conti FWIW.

[Efthreeoh]

Originally Posted by Cloverdale

A quick peruse of what's available indicates alternatives (many still using plastic) aren't much less in price compared to the all metal Pierburg. It's a job time consuming enough that you'll want to also confirm hose conditions. Pierburg boost solenoids are the only one's that are reliable which reflects brand quality. Those hose connections are challenging to get proper due to space limitations so be prepared.

The N52 has always used an all-metal (aluminum) waterpump. The N54 is the E90 engine that uses an OE plastic vane housing that can crack and leak.