Alternator Denso or OEM BMW

Get a Denso reman from RockAuto. It is the same as OEM Denso and is <$200 with core return.

Denso if you can find it. It will last another 25 years

Fix that, then replace with a reman Denso alternator from RockAuto.

What sort of alternator are you installing, because I've had two Chinese alternators fail but a genuine denso from pull a part has survived a good thrashing

On my 2010 Corolla I replaced it with a Duralast one and it lasted a couple months, then I replaced it with a Denso one and haven't thought about it since. Cars got almost 250k miles on it.

I supply Denso alternators for d3,4 Rrs

Denso is the OEM. I chose to rebuild mine with new bearings and brushes from Honda. The rectifier was the actual bad part, though. I put an aftermarket rectifier in for $30.

I got denso on my car and it's perfectly fine

Drives fine, maybe a bit of whirr from the alternator area but hard for my ears to tell of that's out of normal none of the unhappy noise from before battery kicked it.

The alternator of my Corolla died. I bought a reman Denso alternator from RockAuto and made the swap. However, the new alternator makes a loud, screeching sound when I start the car. It goes away after a minute-ish.