http://www.boschautoparts.com/promot...Up_OL_0711.pdf
$1 per plug on Platinum+4 or Platinum Plus
$2 per plug on Iridium
Up to 16 rebates per person! Good through 12/31.
Bosch lists the 7406 (FGR7KQE0) as OE for the S4. It's nickel-ytrrium multi-electrode. This plug, however, is not eligible for the rebate.
Or you can run the 4417 (FGR7DQP) for the S4. This is the Platinum+4 OEM-equivalent and IS eligible for $1 back per plug.
For those interested, the only difference that I can see (other than the electrode material) is the height of the electrode. According to Bosch's designation code sheet, the OE plug has a 4mm tall electrode and the OE equivalent is 3mm. So far I have not seen any particular reason for this...perhaps Audi and Bosch determined emissions or performance was better with more cylinder protrusion?
And for those of you who want to pick your own plug, these are the specs a stock S4 needs:
Thread size = 14mm
Reach = 19mm (3/4")
Hex size = 16mm (5/8")
Seat = gasket
Resistor = yes (interference suppression)
Gap = 1.4mm (0.055")
Heat range = 7
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