I'd swap them out for multi-layer steel gaskets and new head bolts. Given the engine is in good order and hasn't had a gasket failure yet I'd say you'd be fine skipping the head decking and just install the new gaskets after a good cleaning.
Aisin is the maker of Toyota water pumps.
I have only got my AISIN water pumps when ordering timbing belt replacement kits which include a new water pump, but they always came with a quality seal for the pump.
A Bosch o2 sensor is going to work just like oem, an aisin water pump is going to last as long as oem. But moog balljoints don\u2019t.
My 2019 rs5 water pump went out at 72k miles
I own a 2021 S5 with around 55k miles on it, bought it with around 50k miles on it. Only issue is that the water pump did fail and coolant migrated into the vacuum system which is a ridiculously common failure on these cars.
I'm currently driving a brand new Q5 while my car gets a new water pump. The dealership *apologized* for giving me that loaner Q5... lol. I honestly, really, truly hate it. It has a premium price, but sitting in it with all the plastic everywhere, does not feel premium.
I can\u2019t believe my Audi has a plastic water pump and that when it went it took the oil cooler with it. The damn thing died at 44k miles.
The Aisin kits are fine. I would not use a gates kit; the water pumps are junk and so are the tensioners
I want to share a brief but critical report regarding the recent replacement of the engine's electric water pump (EWP) on my Prius Gen 4. The analysis of the data logs revealed an alarming scenario; the new aftermarket pump's performance was completely unreliable, showing clear evidence of torque failure and instability. I had no choice but to purchase the Original Equipment Manufacturer (OEM) pump from the dealership (it was stamped with the AISIN logo). The problem was instantly and definitively solved.
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