Threads were pretty loaded up with carbon on the T5 when I first did the plugs at 90K....bought the car with 72K... Made getting them accurately tight a challenge. I spent the few extra minutes per cylinder to run a tap through the threads to clean them. It was a bit challenging because the plug wells are so deep, but it really made a difference. Prior to the tap, I could barely hand turn the plugs in...and they felt gritty while doing it. After the tap, smooth and easy, just like they should be. I doubt a professional mechanic would take the time for that extra step, they're on the clock, but my time is my own....
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (126K, Michelin AS4, HPL 0W40)
2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
2004 V70R (143K, six speed M66, HPL 5W40)
2004 XC90 (235K, HPL 0W30 Euro)
2002 V70-XC (295K, HPL 0W30 Euro)
2002 V70-T5 (225K, IPD bars, Bilsteins)
2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)
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