What kind of Oil do you use in your ML? - Mercedes-Benz Forum
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#1 (permalink) Old 05-16-2011, 02:35 PM
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What kind of Oil do you use in your ML?

Looking to do an Oil change, Mercedes told me use what they do- Mobil 1 5w-40 Full Synthetic, But I've also heard since I live in Texas with the Summer Heat easily topping 100+ degrees, The oil thins so use a little thicker like a 10w-30 or 10w-40. I called a few oil change places and they all give me different answers. (0w-30, 0w-40, and more). So, whats recommended? What do you use? I've also got 120,000 miles, does that effect what kind of oil I should use?
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#2 (permalink) Old 05-16-2011, 03:06 PM
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Just about any generic bulk oil will do, such as those used by the 25$ oil change mechanics.

... and this important discussion continues.


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#3 (permalink) Old 05-16-2011, 03:08 PM
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I think you have a misunderstanding of what the grades mean. The number on the right is short hand for the viscosity of hot oil whereas the number on the left is for cold oil. Increasing numbers mean higher viscosity at the temperature range. Thus 40 is 'thicker' or more viscous than 30 and 0 is thinner or less viscous than 10. For the earlier MYs, the original oil spec was 0w-40 and was later replaced by 5w-40. In some of your examples, you actually thickened the cold viscosity and thinned the hot viscosity relative to 5w-40.

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#4 (permalink) Old 05-16-2011, 04:54 PM
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Originally Posted by mickey.1430 View Post
I think you have a misunderstanding of what the grades mean. The number on the right is short hand for the viscosity of hot oil whereas the number on the left is for cold oil. Increasing numbers mean higher viscosity at the temperature range. Thus 40 is 'thicker' or more viscous than 30 and 0 is thinner or less viscous than 10. For the earlier MYs, the original oil spec was 0w-40 and was later replaced by 5w-40. In some of your examples, you actually thickened the cold viscosity and thinned the hot viscosity relative to 5w-40.
Appreciate the info. Yes I have a misunderstanding of a lot of things.
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#5 (permalink) Old 05-16-2011, 06:05 PM
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The spec oil was 0W40 Mobil 1 in the US for your engine, across all MB models. This spec has never changed for the W163, but under "gray area spec" MB dealers started using 5W40 because they could get that weight in bulk drums (cheaper) since 0W40 is available only in bottles.

Interestingly, 0W40 Mobil 1 has a slightly different formulation, and slightly more serious' formulation for anti-sludge than 5W40.

When in doubt, stick the the MB spec (not gray area) and make sure you use a fleece filter (not paper).

8.5 quarts for the fill, so this oil change looks expensive, but it's good for 10K miles so what the heck.
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#6 (permalink) Old 05-16-2011, 07:52 PM
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0w40 mobile 1. Not expensive consider for 10K miles. MB 1 goes on sale pretty often and i load up for next oil change.
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#7 (permalink) Old 05-16-2011, 07:59 PM
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Rotella or Mobil 1 5w-40 is what I use...whatever is on sale when I need to swap oil. Only MB filter though.

As for recommended...that is in constant debate. I heard 0W-40 last IIRC. I'm sure searching would net you both answers on what to use and how grading of oil works.

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#8 (permalink) Old 05-17-2011, 04:03 AM
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My independent dealer used Castrol Longtec. This is only available to the trade. When I asked what oil to use as a top up, I was told to use Castrol Edge as it was basically the same oil. Maybe this is just an Australian thing.
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#9 (permalink) Old 05-17-2011, 08:33 AM
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Mobil ONE 0W40 since day one (October 1998) on my ML430 with oil changes every 10,000 miles. I swapped over to the fleece filter as soon as it came on the market. I do my oil changes myself using the vacuum method.

I occasionally notice a little of the oil "whip" when removing the oil fill cap, but not on a regular basis. This condition seems to be tied to operating the ML on short trips around town. Whenever I take a long-distance trip and the engine is at regular operating temperature for a length of time the "whip" disappears.

I have accumulated 308,000 miles and she burns very little oil. I would not even consider any other brands/weights. Just my opinion..........
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#10 (permalink) Old 05-17-2011, 09:17 AM
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Originally Posted by springerfever View Post
I have accumulated 308,000 miles and she burns very little oil. I would not even consider any other brands/weights. Just my opinion..........


And I thought my 190K was impressive.

Just curious, how much oil does she use? I have used Mobil 1 0W40 also and use about a quart maybe a quart and a half each 10K.
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