Audie oil change intervals - Synthetic

[rallen <rpainc@EPIX.NET>]

Hi Guys and Gals!
Any advice/experience with synthetic that suggests I could/should go 
beyond 7500 miles in my 90 V8 Quattro if I switched to synthetic.  If you 
do extend how often do you change the $20 oil filter?  Currently I'm 
doing 5000 oil & filter changes with non-synthetic 20-50W.
Thanks! :+}  Richard

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