For my 95 4.2 D2 A8, carsparkplugs.com are recommending:
HGR7KQC
Bosch Super Spark Plug
at £3.62 each and £28.96 for the 8 ex. VAT
and
BUR6EFSZ
NGK Spark Plug
at £3.26 each and £26.11 for the 8 ex. VAT
I see that it is recommending different plugs for the S8 compared to the A8 and different plugs after 1999
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