X166 Spark Plug Change?
03-01-2015, 08:37 AM
#1
Junior Member
Thread Starter
Join Date: Jun 2005
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
X166 Spark Plug Change?
Has anyone done a spark plug change on the X166 M278 engine? I'm not sure if the access is from the top or bottom. I've search and could not find a DIY on this engine.
03-02-2015, 10:57 PM
#2
MBWorld Fanatic!
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...
03-05-2015, 04:49 PM
#3
Super Member
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.
03-06-2015, 06:58 AM
#4
Junior Member
Thread Starter
Join Date: Jun 2005
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
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.
03-06-2015, 10:55 AM
#5
Super Member
04-17-2021, 12:47 PM
#6
Newbie
Join Date: Apr 2021
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
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
04-18-2021, 09:15 AM
#7
Out Of Control!!
Join Date: Sep 2018
Location: unbegrenzt
Posts: 13,349
Received 3,937 Likes
on
3,100 Posts
2017 GLE350 4MATIC
Here is an M278 spark plug video for W221. Lots will be similar with X166. Senior Leigh is user @39039 on this site.
Trending Topics
04-18-2021, 10:49 AM
#8
Member
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.
04-18-2021, 11:05 PM
#9
I have 72k on mine. Are those cheap $10 Bosch ones equivalent OEM? Anything slightly better?
04-19-2021, 08:15 AM
#10
Out Of Control!!
Join Date: Sep 2018
Location: unbegrenzt
Posts: 13,349
Received 3,937 Likes
on
3,100 Posts
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.
The following users liked this post:
mikapen (04-20-2021)
04-19-2021, 09:48 AM
#11
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.
