Water pump AISIN or GRAF

We used an Aisin water pump. We have had no problems with this water pump as of 11k miles on the engine rebuild now.

I personally replaced the water pump on my Tiguan with a Graf aluminum pump. The only issue I've had was the rubber o-ring on the temp sensor leaking. I replaced all the rubber seals with Rein branded ones and no more leaks.

I had my timing belt done by not a Volvo specialist specifically, but a “European brand” mechanic. They used an Aisin pump / Gates belt kit and life is good.

There’s a really good kit that come with gates timing belt, tensioner, idler, Aisin water pump, Toyota cam and crank seals and a serpentine belt for $350 I used it and everything has worked perfectly

You should be fine with the Aisin. They were the OE manufacturer for a lot of makes.

I finished the water pump replacement with the Graf Aluminium pump. Nice pump. As per Qmulus recommendation, I replaced the coolant sensor Oring with OEM. While in the process, I replaced the oil filter housing along with a new oring for it.

I have been running the Graf AL pump for about 10k so not long enough to give a full assessment, but the quality was awesome and very pleased with it.

Graf does make an AL housing pump which I used this last time. Time will tell if it holds up better the the Rein plastic AM one installed in the CC.

Okay, so I installed a new aftermarket pump in my MK4 Jetta 2.0 last year. Went with the seemingly highly recommended GRAF metal impeller pump that many forum members across multiple forums seemed to stand behind... 14K miles later and it's leaking. Anyway, after doing some more research, it seems that it's considerably more common for aftermarket metal impeller pumps (especially GRAF, but seemingly all of them from what I can find) to fail prematurely for some reason...

The stock pump failed back in Feb 2010, so i ordered a GRAF pump with metal impeller from ECS Tuning. Purchase was made on 1/27/10, parts got here on 2/03/10, and I installed pump late Feb 2010. Mileage was 127,257 when pump, timing belt, tensioner were done. In the middle of 2010, a loud grinding started at the front passenger side of the engine. I took everything apart and found the water pump with bearing grease or some waxy chunky crap all over the outside of it and on the inside of the timing belt cover like it splattered, and the pump leaking from the shaft. Car now has 135,362 miles on it, so thats complete pump failure within 8,069 miles.