1971 280SE: motor oil ? - Page 2 - Mercedes-Benz Forum

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post #11 of 13 (permalink) Old 08-06-2013, 11:15 AM
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Originally Posted by sokoloff View Post
Do some research on synthetic. It does not cause leaks. In fact in many cases it stops leaks. If your car already had leaks, then they need to be attended to. Synthetic causing leaks is an issue that was an issue twenty to thirty years ago when they were first starting to get widespread use. That is old news since synthetics have additives that swell the seals just like dino oils. I have used synthetics in every car below except the 240D and no new leaks.
I think doing research here is the key. I tried synthetics in my 108 4.5, and it left multiple pools all over my driveway. For older cars like ours, the seals may thin out a little, allowing the synthetic stuff to leak through. I'm not familiar with synthetics causing the seals to swell a little, but I've not looked into the stuff since 2005... I'm sure there have been advances. I'm wondering if one can find synthetics for older engines.
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post #12 of 13 (permalink) Old 08-07-2013, 07:45 AM
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Lubrication science is a subject that has been covererd in articles in several car enthusiast magazines. While it is possible to independently research the subject why not simply call the technical department of one of the oil companies and speak with a lubrication engineer? They are very knowledgable and eager to help.

Here's an example. My 1932 Ford roadster street rod has a Chevy Vega steering box. GM once supplied a specific lubricant for steering boxes but it is no longer available, and in fact has not been available for years. A quick call to the technical department of Shell Oil identified a currently available exact equivalent and Shell even sent me a free can of the stuff as a "sample".

How can opinions from amateurs match that?

Ray W
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post #13 of 13 (permalink) Old 08-07-2013, 10:43 PM
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Originally Posted by Palolo View Post
My .02 is...

Any Diesel engine oil, in a weight suitable for your climate.
that is the correct oil type to buy.

I use Delo Gold . diesel oil by Chevron/Caltex
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