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#1
24th May 2025, 05:16 PM
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Service parts for the D4 W12
Hi all, I've got so far with parts, I've already changed the oil & filter but I need confirmation with the following if anyone can help please?
Thanks in advance.
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A8L W12 (D4 2015) Last edited by Horrgakx; 24th May 2025 at 05:19 PM. 
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#2
25th May 2025, 09:06 AM
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All the part numbers you've listed are suitable for your W12.
As for the spark plugs, I can't find any information on the differences between the two, other than what it states on the page you linked to, and that is one has a solid SAE connector at the top, and the other has a crimped connector, and that single difference accounts for a weight difference of 9g.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold!  2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II HeadlightsMy DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds
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#4
25th May 2025, 01:53 PM
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The biggest difference is that VXUH22I uses more traditional design with narrow Iridium centre electrode and flat shaped Platinium disc on ground electrode, on IXUH22FTT ground electrode has thin Platinium tip, look at the pictures, you will see the difference. In theory thin tip may have better exposure and ignite mixture faster and more efficiently resulting in better efficiency reducing fuel consumption and increasing power but may wear out sooner and have shorter life. In real life for stock engine there is probably no noticeable difference.
For the connector, again there is probably no measurable difference in real life, crimped may have slightly higher resistance but considering that it's thousands of volts and very little Amps, I don't think it matters. It would matter if it was other way round with little voltage and lot of Amps. In theory also if not crimped properly it could work loose and separate. So in theory solid is better but in real life no difference unless there is manufacturing defect and not crimped on properly.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure Last edited by ainarssems; 25th May 2025 at 02:02 PM.
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Linear Mode
