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It ended up being the water pump seal. They replaced the water pump and thermostat free of charge.
I put a gates on my 2005 in August. No issues so far.
I got a metal impeller gates and I’ve been beating on it for five years or more without any hiccups.
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.
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'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 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.
During COVID, that water pump was on backorder from Ford so I used one from Gates. I guess Gates had a bad batch and 2 of their's failed in the span of less than a year.
The only one to really avoid out of the 5 choices on Rockauto is the Gates, because of the cheap stamped impeller. Personally, I would not go with an aluminum pump body in this application, but that's just my opinion after working on vehicles for a living for 45+ years.
I used a Gates pump the first time and it leaked. I uninstalled it, cleaned everything up, regreased all the seals, and reinstalled it it... still leaked. Turns out the Gates water pumps for the ecodiesel are just garbage.
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If choosing water pump across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare water pump across these categories:
In March 2026 on PartReview, water pump OEM BMW were overall better than Gates.
Water pump Gates and OEM BMW were equally popular according to data in March 2026.
By vote balance, water pump OEM BMW surpassed Gates:
By number of reviews, water pump Gates surpassed OEM BMW:
In March 2026, according to PartReview, water pump Gates and OEM BMW have not taken top places in car-specific ratings. You can help by adding your review about these manufacturers.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of water pump Gates with: OEM Volkswagen, OEM Audi, GRAF, AISIN, Hepu, Pierburg, OEM FORD, OEM Toyota, GMB, Saleri.
Also available: comparisons of water pump OEM BMW with: OEM Volkswagen, OEM Audi, GRAF, AISIN, Hepu, Pierburg, OEM FORD, OEM Toyota, GMB, Saleri.
You can also see who is better among other water pump manufacturers: OEM Audi or OEM Volkswagen, GRAF or OEM Volkswagen, AISIN or OEM Volkswagen, Gates or OEM Volkswagen, Hepu or OEM Volkswagen.