X166 Spark Plug Change?
MBWorld Fanatic!
Joined: Nov 2012
Posts: 6,130
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A gaggle of MB's
I don't know of anyone who has reached 100K to change OE plugs yet - there "might" be someone out there who has gone to upgraded ECU where "plugs" are changed to a slightly different temp range - maybe yes/maybe no...
Super Member
Joined: Feb 2007
Posts: 948
Likes: 110
From: NYC
18 E63s Wagon 15 GL63 (sold), 10 Turbo TT MT, A36 Bonanza, 20 JLU Rubicon
I hear that it is a ***** on the M157.. I assume that you are going to replace the airfilters too? (I have a pair of BMC with 3K on them that I will sell you).. (on my GL63 they have tripped a check engine light twice per the dealer service tech) (and the tech pointed out that they let a fair amount of dirt in..... I'm dubious about that but I took them out anyway). I did run my GL550 to 87K with them and no issue..
PM if interested.
PM if interested.
Thread Starter
Junior Member
Joined: Jun 2005
Posts: 67
Likes: 0
I hear that it is a ***** on the M157.. I assume that you are going to replace the airfilters too? (I have a pair of BMC with 3K on them that I will sell you).. (on my GL63 they have tripped a check engine light twice per the dealer service tech) (and the tech pointed out that they let a fair amount of dirt in..... I'm dubious about that but I took them out anyway). I did run my GL550 to 87K with them and no issue..
PM if interested.
PM if interested.
Newbie
Joined: Apr 2021
Posts: 2
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1992 300e, 1995 S320 LWB, 2006 R350, 2013 GL450, 1984 300CD Turbodiesel, 2015 Sprinter 3500 V6 170EX
On my 13 STOCK GL450 I have 120k Miles on my plugs. I’m changing them today- Man it’s a PITA
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Member
Joined: Jul 2017
Posts: 210
Likes: 25
From: Lake Wylie, SC
E500 Wagon, SL63 IWC, E450 Wagon
My only guidance is to torque to spec and be very careful removing the clips to the ignition coils. I had two crack and had to replace them. Taking the wires out of the old ICs to put them into the new connectors was a PIA.
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Junior Member
Joined: Jun 2010
Posts: 45
Likes: 1
2016 GL 450
I have 72k on mine. Are those cheap $10 Bosch ones equivalent OEM? Anything slightly better?
Out Of Control!!
Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
I would use MB plugs. The indexing is accomplished by the combined tolerance of the spark plug thread and crush washer plus the torque spec. Thread and washer tolerance have the best chance of being correct with MB plugs. There is a pdf saved several times on this site showing what a non-OEM plug looks like from an indexing point of view. Spend the extra money and get the OEM plugs.
Junior Member
Joined: Jun 2010
Posts: 45
Likes: 1
2016 GL 450
I would use MB plugs. The indexing is accomplished by the combined tolerance of the spark plug thread and crush washer plus the torque spec. Thread and washer tolerance have the best chance of being correct with MB plugs. There is a pdf saved several times on this site showing what a non-OEM plug looks like from an indexing point of view. Spend the extra money and get the OEM plugs.
