Could someone tell me if the O-Ring on the end of the water pump is the same as the o-ring thats behind the flange that connected to the engine block. it's on a R53 MCS. Thanks just need to order a couple new o-rings wanna get the right ones

 

11517509186 O-RING - 34,52X3,53 2 $4.02Yes they are the same. I just replace my water pump and supercharger so I had to get these. p/n 11517509186
http://www.penskeparts.com/DiagramsM...1&rnd=03192010

 

thanks for the reply.. is there a certain rad fluid that I should use.. or do I have to purchase it directly from BMW ?

 

I've been using Prestone 50/50 with no problems. Change it every two years. 166,000 miles

 

Zerex, Peak, Prestone work.

 

the Prestone 50/50 mix will work ok? i wont need to mix in any water.. i know this sounds like a dumb question.. just want to make sure.

Thanks again.!

 

Yes, it's ok, any Good 50/50, just not Dex-cool.

 

Thanks Very Much!

 

Yes the water pump O ring is the same on the flange.

As for coolant you can use about anything but do NOT use Dex cool pink as it will turn to gel when mixed with regular coolant.