Are these genuine NGK plugs

Yes they are. Put them in a 2012 Cadillac. Car is still running just fine.

Gap was .041, spark plug off my 2011 Mustang V6 were 0.050, why the difference?

Most all plugs come new at around .038. they have to be gapped according to specs by the engine manufacturer. Worn plugs will have a wider gap due to deteriorated metal and heat.

Has anyone tried this on a lincoln mkx?

must be applied by engine size not car model

Is it fit Volkswagen Tiguan 2.0 tsi

NGK has multiple grades of plugs that may fit your vehicle. It is recommended to go to NGK site at https://ngksparkplugs.com/en/part-finder to verify the applications that will fit your vehicle. This site will show you all of the available plugs to fit your vehicle and will also show you which grade plug is recommended for the best performance of your specific engine.

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⚡ Ignite Performance, Drive with Confidence!

MADE IN USA - Proudly crafted in the USA, combining quality and performance you can trust.
PRECISION FIT - 14mm thread size guarantees perfect compatibility with your vehicle’s engine.
TRUSTED BRAND - Manufactured by NGK, a global leader in spark plug technology and reliability.
BULK VALUE PACK - Sold in convenient packs of 6 to keep your ride running smooth without frequent reorders.
UNMATCHED LONGEVITY - Iridium tip ensures superior wear resistance and longer engine life.

The NGK #6509 Iridium Spark Plug LTR6IX-11 is a premium 14mm threaded spark plug featuring a durable iridium core for enhanced engine efficiency and longevity. Sold in packs of six, it offers excellent value and reliable performance, manufactured by NGK in the USA for professional-grade vehicle maintenance.

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Brand	NGK
Core Material	Iridium
Thread Size	14mm
Top Material Type	Iridium
Vehicle Service Type	Car
UPC	087295065099
Manufacturer	NGK
Product Dimensions	9.4 x 2.39 x 12.65 cm; 299.37 g
Item model number	LTR6IX-11
Manufacturer Part Number	6509
Position	Center
Manufacturer	NGK
Country of Origin	USA
Item Weight	299 g

NGK # 6509 Iridium Spark Plug LTR6IX-11 - 6 PCSNEW

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