GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Who makes stock spark plugs?

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Old 09-18-2018 | 12:21 PM
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GLguy's Avatar
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09 GL450
Who makes stock spark plugs?

I am going to replace spark plugs on my truck soon and I wonder who makes stock plugs? NGK? I know many people use Bosch for replacement, but I do not think that's stock. Just researching different option.
Old 09-18-2018 | 01:05 PM
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eric_in_sd's Avatar
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2007 GL450
Originally Posted by GLguy
who makes stock plugs? NGK? I know many people use Bosch for replacement, but I do not think that's stock.
Pretty sure it is in fact Bosch that makes the OEM. That's what Bosch claims, anyway.

Frankly I'd just keep an eye on your engine computer's misfire codes and wait until you get actual misfires before changing them. They fail gradually.
Old 09-18-2018 | 02:25 PM
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2010 Mercedes GL450; 2000 Mercedes ML55 AMG; 2016 VW GLI SEL Stick!!!
Originally Posted by eric_in_sd
Pretty sure it is in fact Bosch that makes the OEM. That's what Bosch claims, anyway.

Frankly I'd just keep an eye on your engine computer's misfire codes and wait until you get actual misfires before changing them. They fail gradually.
004159180326

thats the part number of the oe plugs from Mercedes on my service order.

Bosch apparently.

Oe plugs on my w163 were ngk
Old 09-18-2018 | 06:01 PM
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Originally Posted by kombifan

004159180326

thats the part number of the oe plugs from Mercedes on my service order.

Bosch apparently.
Yes, those are Bosch and the ones you should use. They are essentially not available in the aftermarket since they are non resistor and all aftermarket versions are resistor. Bosch sparkplugs (the OE ones) are made for specific vehicles and come out of the box with the correct gap ... just install them.

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