Part Replacement/Services 75,000/100,000 miles
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Mercedes-Benz GLK 350
Part Replacement/Services 75,000/100,000 miles
I’m nearing the 75,000 mile point on my vehicle and I wanted to know what major things I should get done to it. I only have had one issue so far and it was for a bad ignition coil on cylinder 6 which gave me a check engine light. After fixing, the engine light went away. Sometime within this month I plan on getting all ignition coils replaced. Besides that, I have had no major problems with my vehicle so far after buying it at 45,000 miles. Any suggestions for part replacements/servicing in the 75,000-100,000 mile point? Thanks.
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2013 glk 350
Why waste money on coils if it not misfiring ? Are you replacing plugs also? Then figure in new plug boots. Coils are a waste of money if they work. Are all fluids changed ? Transmission , differentials , brake , coolant , oil? Check motor vacuum to see if PVC is bad. Look for any leaks, look at belts and hoses. Look at oil pan gaskets . At 77000 my hoses leaked, my water pump gasket is leaking, oil pan leaks . I have oil leaks at the cam adjuster. Fix things that you can verify are going bad.
Last edited by Mmr1; May 3, 2024 at 06:49 AM.
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2011 GLK 350 4Matic
+1 on not replacing perfectly good coils. These are very reliable vehicles, so there aren't a lot of "worn out things" to deal with. Motor mounts can get "worn out" (probably better described as "baked" since they live 1" under the exhaust manifold). Spark plugs are due at some point in that range (just changed what I believe were the original plugs on my 159,000 mile project GLK, and the engine was running fine). I'd suggest swapping out the PCV components (oil separators and maybe the associated hoses) mainly to protect the intake manifold's inner flaps and linkages.
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Mercedes-Benz GLK 350
Why waste money on coils if it not misfiring ? Are you replacing plugs also? Then figure in new plug boots. Coils are a waste of money if they work. Are all fluids changed ? Transmission , differentials , brake , coolant , oil? Check motor vacuum to see if PVC is bad. Look for any leaks, look at belts and hoses. Look at oil pan gaskets . At 77000 my hoses leaked, my water pump gasket is leaking, oil pan leaks . I have oil leaks at the cam adjuster. Fix things that you can verify are going bad.
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Mercedes-Benz GLK 350
+1 on not replacing perfectly good coils. These are very reliable vehicles, so there aren't a lot of "worn out things" to deal with. Motor mounts can get "worn out" (probably better described as "baked" since they live 1" under the exhaust manifold). Spark plugs are due at some point in that range (just changed what I believe were the original plugs on my 159,000 mile project GLK, and the engine was running fine). I'd suggest swapping out the PCV components (oil separators and maybe the associated hoses) mainly to protect the intake manifold's inner flaps and linkages.
Last edited by rick223; May 3, 2024 at 10:39 AM.
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I mean at some point coils will go bad. If one went bad most will likely go bad sooner or later. Plus it’ll be something I won’t have to worry about in the future. Soon for my B service, I will do coolant and brake fluid exchange. I’ve done transmission and rear diff once but how often should I do them?
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2011 GLK 350 4Matic
Actually, if you replace all your coils with official MB new coils, it'll be more likely that you'll have a failure for a while than if you hadn't replaced them (look up "bathtub curve"). After some time, the chances of failure will revert to the "very unlikely level" again - just like before you replaced them and spent a whole lotta money.
If you buy six shiny new aftermarket coils, the chances of a failure will go WAY up.
If you buy six "MB coils" from many of the online vendors, you may get counterfeit parts - see above.
As a reference point - I've been buying and driving high-mileage European cars for decades (130-250,000 miles, 12-18 years old). I've had exactly one coil fail during that time (on a 2001 Volvo V70 T5 with well over 200,000 miles when I bought it). If I'd replaced all those perfectly good "old" coils I'd have spent a fortune and done almost no good. It would have likely prevented that one failure, but could have well created another failure (brand new coils being more likely to fail than 150,000 mile coils, at least for a while).
But hey - some people insist that changing the air in their tires will help - something, not sure what. ;-)
If you buy six shiny new aftermarket coils, the chances of a failure will go WAY up.
If you buy six "MB coils" from many of the online vendors, you may get counterfeit parts - see above.
As a reference point - I've been buying and driving high-mileage European cars for decades (130-250,000 miles, 12-18 years old). I've had exactly one coil fail during that time (on a 2001 Volvo V70 T5 with well over 200,000 miles when I bought it). If I'd replaced all those perfectly good "old" coils I'd have spent a fortune and done almost no good. It would have likely prevented that one failure, but could have well created another failure (brand new coils being more likely to fail than 150,000 mile coils, at least for a while).
But hey - some people insist that changing the air in their tires will help - something, not sure what. ;-)
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2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
Water pump is a lot of work to do before it fails. But if it will shut you down in mid winter, schedule it with other service like spark plugs, coolant, and a B service when you can clear the time.
The only thing that failed on my 2015 GLK350 in 155k miles was the crankcase vent valve. If you’re down for water pump and plugs, maybe that would be a good time to replace it.
Followed recommended maintenance except spark plugs. Maintenance schedule said 46,500 miles. I went 100k with no misfires or performance issues. They looked used but fine when removed.
The only thing that failed on my 2015 GLK350 in 155k miles was the crankcase vent valve. If you’re down for water pump and plugs, maybe that would be a good time to replace it.
Followed recommended maintenance except spark plugs. Maintenance schedule said 46,500 miles. I went 100k with no misfires or performance issues. They looked used but fine when removed.
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2011 GLK 350 4Matic
Having just pulled out what I believe were original plugs on my 159,000 mile project GLK, the one rationale I can think of for changing plugs more regularly is that those old (!) plugs were a bear to get out. Even so, I believe that 100,000 miles (assuming you are using iridium plugs) would be a good replacement interval.
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Having just pulled out what I believe were original plugs on my 159,000 mile project GLK, the one rationale I can think of for changing plugs more regularly is that those old (!) plugs were a bear to get out. Even so, I believe that 100,000 miles (assuming you are using iridium plugs) would be a good replacement interval.
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2013 glk 350
That’s not true, the ignition of that newer mb is Multi spark, plugs don’t control electricity going to them . Plugs are just plugs , the ignition controls them . Iridium last 100,000 miles plus
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