S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

Ko4s or ko3s?

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Old 09-03-2006, 05:24 AM
  #11  
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Default from what ive heard, their time to failure is more predictable than K03s but not necessarily

bulletproof like some think

unless of course youre running a very conservative tune
Old 09-03-2006, 05:24 AM
  #12  
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Default It's been said that due to the extra room in the A6 engine compartment that the K03s last longer

That being said, the service history on my A6 showed 2 sets of K03s being replaced under warranty and I replaced the 3rd set with K04s when I bought it.

Ironically, my S4 is still on it's original K03s at 90k, so I'm in no rush to put in my K04s. And yes, I'm chipped and I drive her pretty hard. I just take really good care of her and warm up and idle down, too.
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