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Replacing spark plugs and filter. Anything else at the same time?

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

Replacing spark plugs and filter. Anything else at the same time?

 
Old 09-21-2018, 05:32 PM
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Replacing spark plugs and filter. Anything else at the same time?

I am approaching 70K and 10-year interval and plan to replace spark plugs and air filters. Is there anything else I should do while the top of the engine if off? Any seals, caps, etc? Items which are not listed in the service manual but might be a good idea to replace after 10 years. This is for 2009 GL 450.

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Old 09-21-2018, 07:01 PM
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Originally Posted by GLguy View Post
I am approaching 70K and 10-year interval and plan to replace spark plugs and air filters. Is there anything else I should do while the top of the engine if off? Any seals, caps, etc? Items which are not listed in the service manual but might be a good idea to replace after 10 years. This is for 2009 GL 450.

Thanks.
run an Engine flush whilst your at it if you’re also doing oil and add ceratec when you’re done.
intake manifold? Expensive but the flap tends to break. Mine just got replaced for sticking.

Oil coolee seals? They go. Coolant flush? Power steering flush? Coolant cap tends to go too.

Cabin filter and xenon bulbs if you have them ?

things on the bottom.
Tranny flush. Differential flush. Transfer case flish. ENd link replacements.

Last edited by kombifan; 09-21-2018 at 07:05 PM.
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Old 01-04-2019, 10:25 PM
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I was always taught to replace the coils with plugs but that was when I worked on american muscle. Is that necessary for MB's? I'm at 120K miles. I see fcpeuro has a kit that includes coils which by the way is still cheaper than what the dealer quoted me.

-Mel
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Old 01-05-2019, 01:37 AM
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Coils and wires are not "required" time/mileage for replacement - and are generally replaced if you have specific misfire codes.

Spark plugs - genuine OE equivalent only - don't get sucked in by other pizzaz/hyped plugs.

At 120K/10yrs - if I was doing spark plug job - I would choose to do fresh geneuine Bosch MAF from a reputable seller (like $85-$90) - MAF will ultimately go out-of-normal range and give you CEL - fresh MAF will give you original factory new spec and best fuel economy and performance - up in the engine compartment I would also do fresh coolant change - MB coolant or Zerex/Valvoline G05 only - if mixing concentrate use distilled water only - to bring cooling system back to neutral ph to prevent internal corrosion due to dis-similar metals/hydrolysis.

At 120K/10yrs - I would seriously do tranny fluid change - correct filter - correct fluid - and medical precision correct procedure. Tranny service is key to run up to 200K mark
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Old 01-05-2019, 04:10 PM
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Originally Posted by fabbrisd1 View Post
Spark plugs - genuine OE equivalent only - don't get sucked in by other pizzaz/hyped plugs.
Yes ... and YR7MPP33 and Y7MPP33 are NOT the same thing. The car did not come with resistor plugs, you don't need resistor plugs, and you shouldn't use resistor plugs. Order correct plugs from Mercedes dealer.


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Old 02-05-2019, 04:19 PM
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Originally Posted by lkchris View Post
Yes ... and YR7MPP33 and Y7MPP33 are NOT the same thing. The car did not come with resistor plugs, you don't need resistor plugs, and you shouldn't use resistor plugs. Order correct plugs from Mercedes dealer.
my dealer quoted me like $20 for a plug
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Old 02-05-2019, 06:53 PM
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Originally Posted by lkchris View Post
Yes ... and YR7MPP33 and Y7MPP33 are NOT the same thing. The car did not come with resistor plugs, you don't need resistor plugs, and you shouldn't use resistor plugs. Order correct plugs from Mercedes dealer.
I did a little research on resistor plugs. Conclusion was that the resistors in the Bosch plugs don't make a difference.
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Old 02-05-2019, 07:03 PM
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Originally Posted by eric_in_sd View Post
I did a little research on resistor plugs. Conclusion was that the resistors in the Bosch plugs don't make a difference.
I was hoping to hear this. I literally just ordered a set of the resistor plugs from fcpeuro two days ago, not knowing they were any different since they push those as being OEM... I've read alot of reviews on Amazon from MB owners who say the plugs work great.
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Old 02-05-2019, 08:52 PM
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I replaced the plug wires and coil packs while I was in there. The coil packs and wires are very inexpensive if you buy them online.
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Old 02-06-2019, 03:05 AM
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I did plugs, air mass sensor and air filter. I couldn't even find the crank position sensor or I would have done that too. Actually since my ECM was messed up and got a reman ECM from the dealer installed at $2000. Im thinking I will lay down a heat barrier mat under the ECM to minimize heat.
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