Spark Plug 41-101 (original part number 12568387) is an iridium spark plug. Here's some information about them: Materials and design: Core: Made of iridium, which contributes to stable performance during cold start-up and fast acceleration. Main Electrode: Contains a thin iridium wire to burn off the carbon residue on the candle tip. Single Seal: Prevents interference with vehicle electronics. Advantages: Stable engine performance during cold start. Fast acceleration. Long electrode life. Combustion proof.
BUICK
ALLURE 2005-2009
CENTURY 2002-2005
LACROSSE 2005-2009
LESABRE 1996-2005
LUCERNE 2006-2008
PARK AVENUE 1996-2005
REGAL 1996-2004
RENDEZVOUS 2002-2007
RIVIERA 1996-1999
TERRAZA 2005-2006
CHEVROLET
CAMARO 1996-2002
EQUINOX 2005-2009
EXPRESS 1500 2010-2014ِ
IMPALA 2000-2005
LUMINA 1998-1999
MALIBU 2002-2006
MONTE CARLO 1998-2005
SILVERADO 1500 2010-2013
UPLANDER 2005-2006
VENTURE 2002-2005
For GMC
SAVANA 1500 2010-2014
SIERRA 1500 2010-2013
For OLDSMOBILE
88 1996-1999
98 1996
ALERO 2002-2004
INTRIGUE 1998-1999
For OLDSMOBILE
LSS 1996-1999
REGENCY 1997-1998
SILHOUETTE 2002-2004
For PONTIAC
AZTEK 2002-2005
BONNEVILLE 1996-2005
FIREBIRD 1996-2002
G6 2005-2006
GRAND AM 2002-2005
GRAND PRIX 1997-2008
MONTANA 2002-2006
TORRENT 2006-2009
SATURN RELAY 2005-2006