What spark plug does the 2004-2010 Audi A8 4.2L V8 · 2004-2010 take?

The 2004-2010 Audi A8 4.2L V8 · 2004-2010 takes the BKR6EIX (NGK). Gap it to 0.031 in (0.79 mm). Confirmed against two independent maker sources — your owner's manual is the final word.

2004-2010 Audi A8 spark plug & gap

The exact spark plug your A8 takes, plus the gap and the change interval — cross-checked against two independent maker sources so you buy the right plug the first time.

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4.2L V8 · 2004-20104.2L-V8

Spark plug part number

NGKBKR6EIX(heat range 6 — NGK scale)
DensoIK20

Confirmed from NGK + Denso · verified Jun 2026.

Gap

0.031 in (0.79 mm)

We don't stock a reviewed plug for this engine yet. Search the confirmed part number on Amazon — it's the safest way to land on the right plug.

Find NGK BKR6EIX on Amazon

Where this came from

NGK.com BKR6EIX application page — source
RockAuto catalog — DENSO spark-plug fitment for 2007 AUDI A8 4.2L V8 — source

Part number and gap confirmed against two independent maker sources — never changed by what an affiliate link pays us. Heat range is shown per brand on purpose: a Denso number and an NGK number don't mean the same thing, so never compare them directly. Your owner's manual is always the final word.