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Oil Change for 2008 c300 high mileage.

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Old Nov 10, 2020 | 10:05 AM
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2008 c300 4MATIC Sport
Post Oil Change for 2008 c300 high mileage.

Hi MB lovers. I am new to the group and I was searching for oil change for high mileage Mercedes cars but couldn't find any. I have a 2008 c300 4matic with 139000 miles just got from the US, It is well maintained as I checked the records. I was wondering the type of oil to use for it. My mechanic said I shouldn't use Mobil 1 synthetic which is approved for the car as the car now has a high mileage of 139000. He suggested Mobil XHP. Please advise.

Thanks.

Obi.
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Old Nov 10, 2020 | 10:25 AM
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08 C300
I don't believe 139000miles as high mileage and Mobil1 0w-40 is perfectly fine.

Last edited by white46; Nov 10, 2020 at 10:30 AM.
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Old Nov 10, 2020 | 10:32 AM
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Originally Posted by white46
I don't believe 139000miles as high mileage and Mobil1 0w-40 is perfectly fine.
Hi Thanks. I live in Nigeria where most of our weather is hot. Is Mobil 1 0w-40 still preferable?
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Old Nov 10, 2020 | 02:35 PM
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Check list of approved engine oils from Mercedes.
https://bevo.mercedes-benz.com/bevolisten/229.5_en.html
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Old Nov 11, 2020 | 12:53 AM
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Originally Posted by Obi3ice
I live in Nigeria where most of our weather is hot. Is Mobil 1 0w-40 still preferable?
Since your weather is hot most of the times, you don't need to use 0W-40. Stick with any 5W40 or 5W30 oil that is approved by Mercedes-Benz using the link posted above by fellow @white46.
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Old Nov 11, 2020 | 04:20 AM
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2008 c300 4MATIC Sport
Originally Posted by white46
Check list of approved engine oils from Mercedes.
https://bevo.mercedes-benz.com/bevolisten/229.5_en.html
Thanks for this. Really appreciate.
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Old Nov 11, 2020 | 04:22 AM
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Originally Posted by xsever
Since your weather is hot most of the times, you don't need to use 0W-40. Stick with any 5W40 or 5W30 oil that is approved by Mercedes-Benz using the link posted above by fellow @white46.
Thanks for this. Really appreciate.
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Old Nov 11, 2020 | 09:42 AM
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Originally Posted by xsever
Since your weather is hot most of the times, you don't need to use 0W-40. Stick with any 5W40 or 5W30 oil that is approved by Mercedes-Benz using the link posted above by fellow @white46.
Please is 139000 miles considered as high mileage on the 2008 c300?
I guess any of the approved MB oils of 5W-30 or 5W-40 would work for it?
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Old Nov 11, 2020 | 11:57 AM
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Welcome. My engineer father worked for Mobil and knew the man who originally developed the Mobil 1 synthetic oil. I've successfully used Mobil 1 in my 1991 190E which is your car's great grandparent since it was brand new. You can use the Mobil 1 synthetic in your C class with no problems. 139,000 miles is not high mileage for an MB.
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Old Nov 12, 2020 | 04:22 AM
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Originally Posted by 190Efan
Welcome. My engineer father worked for Mobil and knew the man who originally developed the Mobil 1 synthetic oil. I've successfully used Mobil 1 in my 1991 190E which is your car's great grandparent since it was brand new. You can use the Mobil 1 synthetic in your C class with no problems. 139,000 miles is not high mileage for an MB.
Lolz @ great grandparents.

Thanks for this information. really appreciate.

Last edited by Obi3ice; Jun 22, 2021 at 02:43 PM.
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Old Jun 22, 2021 | 02:45 PM
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Hi all. Is Mobil 1 5W-30 high mileage okay for my Mercedes 2008 c300 with 143000 miles on it?
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Old Jun 22, 2021 | 03:03 PM
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Originally Posted by Obi3ice
Hi all. Is Mobil 1 5W-30 high mileage okay for my Mercedes 2008 c300 with 143000 miles on it?
Only use oils from this list: https://bevo.mercedes-benz.com/bevolisten/229.5_en.html
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Old Jun 22, 2021 | 05:53 PM
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2008 C350-Sport-AMG-Active Agility Pack(Not reliable) +Izuzu KB6 3L(It seems Reliable)+Mazda
Since I use Shell Ultra 5W-40 the knock I heard on startup since relative new at 15000Km, they did notify me they changed from Mobil 1 to inhouse oil, which I also bought which was from a can from Germany. I never could find out the viscocity of the oil.
So I think 5W-40 woud be good for you.

Last edited by Moto_Guzzi; Jun 24, 2021 at 04:25 PM.
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Old Jun 23, 2021 | 12:47 PM
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It's not necessary to start using synthetic oil in high mileage cars that've previously only used conventional oil. The reason for this is that most of the engine wear takes place in the early mileages on a new car. It's in the early mileages of a new car that synthetic is best at preventing that engine wear. Using synthetic oil in an already high mileage vehicle is really after the fact and is therefore not necessary. However since 1997, all MBs left the factory with Mobil 1 in the engine. Whether or not subsequent owners have continued to use synthetic oil is another matter. If you can verify that your car has only had synthetic oil, then synthetic oil would be ok. I was taught this by my engineer father who worked for Mobil and who knew the man who originally developed Mobil 1 and this was what he told my father. I've had Mobil 1 in my W201 (the W205's great grandfather) since it was brand new and that's the only oil I'll ever use.
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Old Jun 25, 2021 | 04:09 AM
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Hi, if you live in hotter climate with your well loved higher milage Mercedes I am sure 5-40, 10-40 semi or full synthetic would be fine I just dont get that hung up on exact grades unless the engine is relativity
new.
What I think really matters is changing the oil and filter often to keep the engine internals clean an the oil in peak condition.
I change my oil and filter once every 12 months or every 10,000km which ever comes first.
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Old May 9, 2023 | 06:09 PM
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Originally Posted by 190Efan
It's not necessary to start using synthetic oil in high mileage cars that've previously only used conventional oil. The reason for this is that most of the engine wear takes place in the early mileages on a new car. It's in the early mileages of a new car that synthetic is best at preventing that engine wear. Using synthetic oil in an already high mileage vehicle is really after the fact and is therefore not necessary. However since 1997, all MBs left the factory with Mobil 1 in the engine. Whether or not subsequent owners have continued to use synthetic oil is another matter. If you can verify that your car has only had synthetic oil, then synthetic oil would be ok. I was taught this by my engineer father who worked for Mobil and who knew the man who originally developed Mobil 1 and this was what he told my father. I've had Mobil 1 in my W201 (the W205's great grandfather) since it was brand new and that's the only oil I'll ever use.

I have a c300 2008 about 178k miles been using normal conventional oil on it advice from my mechanic but it's been making some knocking sound for a while, am thinking of using Mobil 1 on my next oil change, so do u suggest I keep using the conventional oil or should I switch to Mobil 1 synthetic oil
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Old May 9, 2023 | 06:34 PM
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Originally Posted by Kenny007
I have a c300 2008 about 178k miles been using normal conventional oil on it advice from my mechanic but it's been making some knocking sound for a while, am thinking of using Mobil 1 on my next oil change, so do u suggest I keep using the conventional oil or should I switch to Mobil 1 synthetic oil
You should continue using the conventional oil in your car because most of the engine wear has already taken place so switching to synthetic now won't reduce engine wear at this point. It'll just be a waste of money now. Engine wear reduction from using synthetic oil happens in the early miles when the car is new. That mileage is now long gone. You might try a conventional oil formulated specifically for high mileage cars. You also need to get to the bottom of the engine knocking ASAP. That could be serious.
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Old May 9, 2023 | 08:27 PM
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There's a common tale that switching from conventional oil to SYN may provoke the appearance of new gasket/seal oil leaks and worsen those already present......can't say that I have seen a well thought out experiment to test its validity but it has a strong following FWIW.
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Old May 9, 2023 | 09:21 PM
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Originally Posted by 190Efan
You should continue using the conventional oil in your car because most of the engine wear has already taken place so switching to synthetic now won't reduce engine wear at this point. It'll just be a waste of money now. Engine wear reduction from using synthetic oil happens in the early miles when the car is new. That mileage is now long gone. You might try a conventional oil formulated specifically for high mileage cars. You also need to get to the bottom of the engine knocking ASAP. That could be serious.
​​​​​​Hmm ok thanks do u have any suggestions on conventional oil formulated specifically for high mileage cars?
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Old May 10, 2023 | 12:23 PM
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Originally Posted by Kenny007
​​​​​​Hmm ok thanks do u have any suggestions on conventional oil formulated specifically for high mileage cars?
I don't have any suggestions because I've only ever used Mobil 1 synthetic oil in my W201 since it was brand new and that's all I'll ever use in it. Actually, since 1997, all MBs have left the factory using Mobil 1 synthetic but too many owners went back to conventional oil which negated the engine wear protection that synthetic oil provides during the earlier mileages. That's what's happened with your car.
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Old May 11, 2023 | 01:05 AM
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Originally Posted by 190Efan
but too many owners went back to conventional oil which negated the engine wear protection that synthetic oil provides during the earlier mileages. That's what's happened with your car.
Exactly my thoughts! MB engineers figure out the exact proper synthetic oil specifications and testing methodologies for their engines and then some random mechanic ends up recommending MINERAL oil instead of synthetic
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Old Aug 16, 2023 | 10:32 AM
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Originally Posted by 190Efan
You should continue using the conventional oil in your car because most of the engine wear has already taken place so switching to synthetic now won't reduce engine wear at this point. It'll just be a waste of money now. Engine wear reduction from using synthetic oil happens in the early miles when the car is new. That mileage is now long gone. You might try a conventional oil formulated specifically for high mileage cars. You also need to get to the bottom of the engine knocking ASAP. That could be serious.
Thanks, I have worked on the engine regarding the knocking sound, my tappets were all changed, the Crankshafts, chain, the engine block too, it was a total engine rebuild, after doing all the car's sound was restored to normal, but there is a new issue now, the injectors started injecting lots of fuel into the engine making the car not to start, I was told it's the brain box, I have bought 2 different brain box to replace the previous one, it will work well after some time the injectors will start injecting excess fuel again, the injectors have been changed still same results, the new brain box have been tested in a different car and it's working properly, now am confused I don't know what else to do
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Old Aug 16, 2023 | 12:28 PM
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Originally Posted by Kenny007
Thanks, I have worked on the engine regarding the knocking sound, my tappets were all changed, the Crankshafts, chain, the engine block too, it was a total engine rebuild, after doing all the car's sound was restored to normal, but there is a new issue now, the injectors started injecting lots of fuel into the engine making the car not to start, I was told it's the brain box, I have bought 2 different brain box to replace the previous one, it will work well after some time the injectors will start injecting excess fuel again, the injectors have been changed still same results, the new brain box have been tested in a different car and it's working properly, now am confused I don't know what else to do
Have you checked for any engine codes? That might be able to help to determine where the problem is?
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