1973 220D - what kind of oil? - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 08-21-2013, 12:22 PM Thread Starter
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1973 220D - what kind of oil?

The original owners manual (which I still have) says to use 20w50 or 10w40.

I do not live in a particularly hot area (San Francisco Bay area). My mechanic, a MB factory authorized service center, says they use 5-40.

I've looked on the web to see that some folks actually recommend 5-40 for engines with over 100k because it gives more protection (but they might be comparing it to 10-30). As I read more about this it appears that the 5 (the first number) is less important because it's only when cold and the second number - 40 is what's most important and that matches the manual.

I have no opinion except that I want my car to last forever. What does the web think?

Thanks,
Frank
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post #2 of 8 (permalink) Old 08-21-2013, 04:10 PM
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A 15W40 diesel rated oil seems to be the standard with some using 20W50.

Rotella or the Chevron Delo lines are probably the most recommended. I use Delo400 15W40 in all my Benz.
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post #3 of 8 (permalink) Old 08-21-2013, 04:12 PM
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Nothing lasts forever. The OM615 was designed to be overhauled after it wore out.

The upper number is indeed the most important. 5W-40 and 10W-40 oils can be used all year in all climates (although in very cold climates 5W-40 is advisable). 20W-50 and 15W-40 is for summer or for warmer climates. Make sure the oil is diesel rated (API C rated). And read all the oil threads ;-)
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post #4 of 8 (permalink) Old 08-21-2013, 05:56 PM Thread Starter
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I've looked at local stores and the oil my mechanic recommends is Diesel (even turbo charged truck diesel) rated. Curiously it's as hard to find as the 20w50.

I will read the oil threads - I have heard that you should be consistent and add the same oil that is already in there. That makes sense.

Thanks for your thoughts.
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post #5 of 8 (permalink) Old 08-21-2013, 06:43 PM
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Pep Boys, O'Relly's, Autozone, Walmart, they all carry the diesel oil brands I mentioned especially with the number of diesel powered trucks on the road. Truck stops have those brands.
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post #6 of 8 (permalink) Old 08-21-2013, 08:29 PM
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wall mart is the best place for that , use 15 / 40 shell rotella T .
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post #7 of 8 (permalink) Old 08-21-2013, 10:40 PM Thread Starter
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Wallmart did not have Mobil 1 5w40 - at least the one near me, loads of other weights. O'Rielly's neither, they at least had it but only in the BIG bottle.
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post #8 of 8 (permalink) Old 09-07-2013, 06:13 PM
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Use a real diesel oil and do not be swayed by weights. You need the ZDDP to be high enough to protect your engine or it will die.

I am up in Seattle and use Mobil 1 15-50 in my 72 220D. The car runs much better than it did on dino oil. Much quieter and much stronger. You may have build up of sludge that is slowly killing the engine. You will of course have changed oil in the past 5000 miles, so there is no need to worry about mixing, when you change the oil again. Just give it a fresh filter and oil, then keep an eye for the detergents in the oil to have cleaned the crud out of the engine. It will take about 10k miles to fully work, but you will be very happy you did.

Clay

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