NGK BKR6EQUP for spark plugs. Also, check for leak from alternator bracket on driver side. Common problem and difficult to get to. Alternator gasket P/N: 12317507808

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2004 X5 4.4i
2001 E46 M3
1995 E34 525i
2008 Acura MDX
1984 Maserati
2011 997 Turbo