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I replaced the water pump & T-stat on my 135i at 60,000 miles as preventative maintenance. It probably could have waited but it's my daily driver and I didn't want to be stranded.
On 135 I'd do it in the 65-80k mile range.
On 128 I'd wait until higher mileage, and change the coolant every 2-3 years or 24k miles.
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2011 135i w/ DCT | ZSP Sport Pkg | PPK | Ohlins R
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