Ok, so my A6 manual says I should replace the spark plugs every 32,000 miles. I'm over 62,000, so that 2nd set should be about due for replacement. However, some places I've seen discuss 40,000 mile intervals. What is right? Is it different for th S4, vs the A6 and allroad? David -- '00 A6 biturbo 6-speed '01 allroad 6-speed