What oil? - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 07-23-2011, 06:54 PM Thread Starter
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What oil?

What is the recommended oil weight for the M130 engine for a '71 250? Its not listed in the Haynes manual I have.
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post #2 of 11 (permalink) Old 07-24-2011, 12:30 AM
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I used 10W-30 in my 114 - the engine was similar to yours. I'm currently running 10W-40 in my 108.

I'd recommend keeping away from synthetic or any 0 weight oils. They're very good, but leak past the seals of our older engines easily.
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post #3 of 11 (permalink) Old 07-24-2011, 11:17 AM
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The oil weight depends on the outside temperature.
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post #4 of 11 (permalink) Old 07-26-2011, 07:27 AM Thread Starter
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Originally Posted by Govert70227 View Post
The oil weight depends on the outside temperature.
Im in Florida where it is hot 9 months out of the year. I run 0w in my VW but its full synthetic. I was wondering if I would be ok running like a 5w-30 or something. I was hoping maybe Mercedes recommended something in the manual that I dont have.
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post #5 of 11 (permalink) Old 07-26-2011, 08:28 AM
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With these old engines having flat rocker arm surfaces, I've come to the conclusion that modern oils are unsuitable due to the lack of phosphorus and zinc, which help the oil to cling to metal surfaces after running.

You can find these additives and add them to modern oils if you like, or use a diesel oil (like Rotella 15-40). That's what I use in both my 300TD and my 230 fintail. That's a fine oil and available nearly everywhere.

There is a lot of reading on the subject. Search for phosphorus zinc and you will learn about it.

1981 300TD--310k miles
1970 280sel--172k miles
1966 230--162k miles
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post #6 of 11 (permalink) Old 07-26-2011, 06:07 PM
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I'm going to put in my 2 cents worth and sit back with a bag of popcorn.

I use Chevron Delo 400 15W40 in my M110, M115 and M117 year 'round here in the desert.

Carpenterman is dead on with the removal of phosphorus and zinc from the "standard" oils. The Rotella is a good choice also.
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post #7 of 11 (permalink) Old 07-26-2011, 06:58 PM
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I agree with others Delo and Rotella are both good options with good levels of zinc and phosphorus in a good weight for these engines.

I have done a ton of reading on this and being a big user of Mobil 1 in all my cars use 15w-50 Mobil 1 (for the high levels of zinc and ph) in my 72 280se 4.5. People will tell you that you are opening up yourself for oil leaks from the engine using synthetic and while I understand that molecules of mobil synthetic are smaller than traditional oil I have never had a problem with using it.

There are sites that have comparisons of zinc in oil and lots of what seems to be good advice, below are a few I enjoyed.

Engine Oil Revisited January 10, 2008

Oils: What motor oil should I use? Which oil is best for my Porsche or aircooled engine?


Last edited by galaxyjb; 07-26-2011 at 07:02 PM.
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post #8 of 11 (permalink) Old 07-27-2011, 05:55 AM
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Stay with one of these 3 grades 10-40, 15-40, 20-50 (mineral oils no synthetics), depending on your outside temps. There are no specific recommendations based on brands or anything like that. Even if the label says diesel or heavy duty like the castrol 15-40 look at the back label and see API specs C(and other letter) is for diesel and S(and other letter) is for gas. If it has both specs that means it is good for both types (commonly used in Europe). As far as the brand it is up to you. Nowadays Mercedes pulls that marekting bs that Mobil 1 is the best choice, but it all depends on who they sign contract with. I have been using Castrol on my cars and I am happy with it.
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post #9 of 11 (permalink) Old 07-27-2011, 10:06 AM
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+1 for Shell Rotella.

I run it in my M115 and M117 as well as a BMW M50 motor with great results.

Most newer oil formulations have very low levels of ZDDP and are not suitable for our engines.

- Steve
1989 560SEC AMG Euro / 1990 300SE Euro / 1991 500SL Japan / 1997 S500 USA
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post #10 of 11 (permalink) Old 07-31-2011, 08:16 PM Thread Starter
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great stuff guys! thanks alot!
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