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Re[2]: Hydraulic Lifters

     I was pretty sure that all the factory oil filters (and the good 
     aftermarket ones -- Mann, etc.) have the check valve.  For that 
     reason, I started buying Mann filters.  Now, if they don't actually 
     have the check valve, that would explain why the amount of lifter 
     clatter didn't change when I switched.  Maybe I'll buy a turbo filter 
     just to find out if it makes a difference.
     Note:  If the noise is mild, and goes away after oil pressure comes 
     up, you probably don't have to worry.  Mine have been noisy for over 
     120K miles, and they've never gotten any worse.  I also had a very 
     experienced mechanic (who knows Audis inside and out) tell me that 
     Audis are always like that.
     - Dave Dahl  (dad@roadnet.ups.com)
     - '87 VW Quantum Syncro
     - '93 Volvo 850 GLT

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> b) It's significantly influenced by the oil filter - Audi's "turbo" filter 
> cartridges have a non-return valve that keeps oil up in the oilways when the 
> engine is switched off.  Not all turbos have hydraulic lifters - not all 
> hydraulic lifters have turbos.  I believe the filters are otherwise 
> interchangeable.
Do you know if the "turbo: oil filter will interchange with the 1.8L-4cyl 
engine?  I have the same problem, especially when it's cold (like now) 
and I am running synthetic oil.(5W50 Castrol Syntec)
I thought that all of the factory Audi filters and even some of the 
aftermarket ones had the anti-drainback valve.  Do they?