Need help with choice of oil for my new Mercedes

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I just purchased a 2021 Mercedes GLC 300 4Matic SUV with the 2L turbocharged engine. It calls for oil changes every 10K or 1 year but I plan on changing at 5K.

In looking at the owner's manual it states that I should use either 229.51, 229.61 or 229.71. The 229.71 is listed with an asterisk stating it is the best for increasing fuel economy. The 229.51 appears to be 5w-30 or 5w-40, the 229.61 is 0w-30 and the 229.71 is 0w-20. I hope to keep this car for many years and many miles. What would be the best to use to mitigate future problems? I am thinking wear and general GDI issues to avoid.

Thanks for your thoughts
 
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Mahzurrah!
Welcome!

Mercedes is already telling you the 0w20 is aimed at economy, you are intending to keep the car a long time so I'd immediately disregard the 0w20 since wear protection appears to be your top priority.

I'd personally follow the 229.51 spec if it's allowed although I admit I don't know a thing about 229.61. The 229.51 is readily available and a very good performance spec.
 
This is what I use. Costs me about $42 at my Orlando dealer for a six liter case.
 

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This is what I use. Costs me about $42 at my Orlando dealer for a six liter case.
This thing is the same as Mobil1 formula m. Mobil1 0w40 has all the same approvals at half the price. Costco sells 6qt for $26.99 at the moment
 
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I just purchased a 2021 Mercedes GLC 300 4Matic SUV with the 2L turbocharged engine. It calls for oil changes every 10K or 1 year but I plan on changing at 5K.

In looking at the owner's manual it states that I should use either 229.51, 229.61 or 229.71. The 229.71 is listed with an asterisk stating it is the best for increasing fuel economy. The 229.51 appears to be 5w-30 or 5w-40, the 229.61 is 0w-30 and the 229.71 is 0w-20. I hope to keep this car for many years and many miles. What would be the best to use to mitigate future problems? I am thinking wear and general GDI issues to avoid.

Thanks for your thoughts

Go up to 5w30, Mobil1 ESP or Pennzoil euro would me an excellent choice. It’s a hard working turbo, don’t fall for 0w20. They used to recommend 0w40 before
 

1lieutenant

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Thank you all for your answers. I wasn't planning on the 0w-20. I thought that Mercedes was being honest about the reasons for its use. Economy over protection. Please, I am not trying to start any thick/thin wars! I have seen many posts about 0w-20 cars lasting over 200k. I was more trying to decipher 229.51 v 229.61
 
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I think the difference is that 229.51 (and 229.52) are diesel specs, and 229.61 is not?

I would defer to the experts.
 
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Thank you all for your answers. I wasn't planning on the 0w-20. I thought that Mercedes was being honest about the reasons for its use. Economy over protection. Please, I am not trying to start any thick/thin wars! I have seen many posts about 0w-20 cars lasting over 200k. I was more trying to decipher 229.51 v 229.61

Honda Accord? Maybe
A German 2.0T that produces 240hp? Not so sure. These engines were not around long enough to make these claims. But I’m no expert for sure.

As for 229.51 vs 229.61, 51 is an older diesel standard. I thought it was substituted with 229.52. There’s not much room within 61 and 71, I think most of them are 0w20.
If you’re really interested in staying within OEM approved oils, I’d go with Mobil1 ESP 0w20. It’s got all your approvals
 
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This thing is the same as Mobil1 formula m. Mobil1 0w40 has all the same approvals at half the price. Costco sells 6qt for $26.99 at the moment
I would not go Mobil1 0W40 FS in dierect injection engine. It is packed with sulfated ash.
His manual calls for MB 229.51 NOT MB229.5.
Mobil1 ESP 0W30 (available in AAP for $33 and filter for 5qt).
Mobil1 ESP 5W30 (available at NAPA on sale)
Pennzoil Platinum Euro L 5W30 (Wal Mart, $22 for 5qt).
 
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Honda Accord? Maybe
A German 2.0T that produces 240hp? Not so sure. These engines were not around long enough to make these claims. But I’m no expert for sure.

As for 229.51 vs 229.61, 51 is an older diesel standard. I thought it was substituted with 229.52. There’s not much room within 61 and 71, I think most of them are 0w20.
If you’re really interested in staying within OEM approved oils, I’d go with Mobil1 ESP 0w20. It’s got all your approvals
It is not. It is current, and not diesel. These standards are called "oil for engines with aftertreatment equipment" meaning DPF/GPF.
MB 229.51 is gasoline capable standard since 2009 in Europe.
 
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I would not go Mobil1 0W40 FS in dierect injection engine. It is packed with sulfated ash.
His manual calls for MB 229.51 NOT MB229.5.
Mobil1 ESP 0W30 (available in AAP for $33 and filter for 5qt).
Mobil1 ESP 5W30 (available at NAPA on sale)
Pennzoil Platinum Euro L 5W30 (Wal Mart, $22 for 5qt).

I have not recommended using 0w40, that was a reply to another member who's posted a picture of OEM 5w40
 
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It is not. It is current, and not diesel. These standards are called "oil for engines with aftertreatment equipment" meaning DPF/GPF.
MB 229.51 is gasoline capable standard since 2009 in Europe.
"Gasoline capable" doesn't make it a "not diesel" standard. 229.51 and 52 are "Low SPAsh multigrade service engine oils" which (in my understanding) are designed for diesel engines in the first place
 
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"Gasoline capable" doesn't make it a "not diesel" standard. 229.51 and 52 are "Low SPAsh multigrade service engine oils" which (in my understanding) are designed for diesel engines in the first place
MB229.51 was always designed for both diesel and gasoline engines. MB229.31 was diesel specification. When EU moved to ULSG, MB229.51 was also introduced and MB gasoline vehicles in EU are using MB229.51 not MB229.5.
My point about gasoline capable is that it can be used in gasoline engine. I understand that in the US it is considered "diesel" specification. But with availability of ULSG, we can forget that.
 
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MB229.51 was always designed for both diesel and gasoline engines. MB229.31 was diesel specification. When EU moved to ULSG, MB229.51 was also introduced and MB gasoline vehicles in EU are using MB229.51 not MB229.5.
My point about gasoline capable is that it can be used in gasoline engine. I understand that in the US it is considered "diesel" specification. But with availability of ULSG, we can forget that.
I see the confusion now. I did not mean "diesel exclusively" of course, I meant here in the US it's mostly used in the diesels.
At least it was, I just pulled the latest 2020 GLC manual and it's a mess in some sense

229.51, 229.52, 229.61, and 229.71*
* Recommendedfor lowest possiblefuel con‐sumption (lowest SAE viscosity class in eachcase; observe possiblerestrictionsof theapproved SAE viscosity classes).
 
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