Synthetic with High Miles OK? Help? - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 06-19-2006, 08:58 PM Thread Starter
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Question Synthetic with High Miles OK? Help?

I recently purchased an 1983, 380SL with 185,000 miles. Very well maintained.
I would like to change the oil to a synthetic but I am concerned that this could cause issues with seals on high milage cars. At least this is what I have heard.

Is this indeed the case or is it OK to start using Synthetics at this late in the game?

Help is appreciated!
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post #2 of 10 (permalink) Old 06-20-2006, 09:54 AM
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Go to the R107 Forum (which your car is) and search for "synthetic oil". There, you will see several posts on this subject which you can then evaluate. This topic has been discussed within these forums many times.

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post #3 of 10 (permalink) Old 06-20-2006, 05:18 PM
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I don't know about Mercedes specifically, but i have heard the same thing: If the car started out with regular oil, stay with it; switching to a synthetic with a lot of miles will cause the engine to start "using" oil. I don't know about the seals, which would seem to imply an oil leak.

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post #4 of 10 (permalink) Old 06-20-2006, 09:17 PM
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We've had plenty of cars that used to run on conventional oil. When we buy them, we switch them to synthetic oil immediately (or at least until the next oil change interval). No problems have surfaced from doing this, and we've seen better performance, and gas mileage too.

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post #5 of 10 (permalink) Old 06-21-2006, 02:40 PM
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MB was sued (successfully) a few years ago by owners who dealers started on regular oil and then switched them to synthetic oil. The engines experienced all manner of problems from "clumping" to leaking seals. There were a number of MB service bulletins on the subject too. Check them from about five years ago.

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post #6 of 10 (permalink) Old 06-21-2006, 03:08 PM
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Quote:
Originally Posted by Jayhawk
MB was sued (successfully) a few years ago by owners who dealers started on regular oil and then switched them to synthetic oil. The engines experienced all manner of problems from "clumping" to leaking seals. There were a number of MB service bulletins on the subject too. Check them from about five years ago.
Is this the same thing as the engine sludge lawsuit of the MLs?

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post #7 of 10 (permalink) Old 06-22-2006, 04:22 PM Thread Starter
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Quote:
Originally Posted by Jayhawk
MB was sued (successfully) a few years ago by owners who dealers started on regular oil and then switched them to synthetic oil. The engines experienced all manner of problems from "clumping" to leaking seals. There were a number of MB service bulletins on the subject too. Check them from about five years ago.
Did you change to Synthetic On cars with High mileage like my 380 SL 1983 with 185,000? This sludge thing is confusing me.

Thanks for your help.
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post #8 of 10 (permalink) Old 06-22-2006, 05:20 PM
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Actually, I think it was an S-class lawsuit, but it could be the "engine sludge lawsuit" you mention. I just remember there was a lot of $hit about the problems w/ syn v regular oil. I do not recall anything about "high milage" being an issue.

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post #9 of 10 (permalink) Old 06-22-2006, 05:41 PM
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High mileage engines make horrible candidates for synthetic oil ! Stick with regular oil or be prepared to see spots in the driveway.

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post #10 of 10 (permalink) Old 06-22-2006, 06:05 PM
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I have a Road & Track magazine here. In the Technical Correspondence section, a guy asked whether or no putting in synthetic oil would help in his 1972 Chevelle Malibu. The R&T said it was okay. But then again, we're dealing with MB here.


I'd listen to Nutz on this one here. He's got a lot of experience with older cars, so he'd be the expert.

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