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Old 03-16-2011, 10:03 PM   #1 (permalink)
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2002 ml320 engine oil

Can someone tell me which synthetic oil I should use, my mechanic put 10w30 synthetic in my car now is that ok?
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Old 03-16-2011, 10:58 PM   #2 (permalink)
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It depends on what brand. There are several spec oils in various viscosities.

If it's Mobil1 that is *not* spec oil. Check it yourself on Mobil1's web site. If that's the case you need new oil...and a new "mechanic".

Good luck.
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Old 03-17-2011, 04:42 AM   #3 (permalink)
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Mobil1 synthetic 0W-40.

10W-30 is too thick, especially in winter time during the first few seconds after startup.
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Old 03-17-2011, 05:14 AM   #4 (permalink)
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5W-40 is what I use. Made for diesels and works like a charm in our trucks. No muck and I stopped using oil.

Not sure what MB says to use now...I think it's either 0W-40 or 5W-40. I like Rotella...but Mobil 1 is spec.
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Old 03-17-2011, 05:35 PM   #5 (permalink)
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I totally agree with the above fully synthetic 5W40 is perfect for diesel engines. There are many brands that are suitable just make sure it meets the current mercedes specification MB229.3/MB229.5 (MB229.31/MB229.51 if particulate filter fitted)

Last edited by tony jr; 03-17-2011 at 05:38 PM.
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Old 03-26-2011, 09:58 AM   #6 (permalink)
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Originally Posted by tabocat View Post
Can someone tell me which synthetic oil I should use, my mechanic put 10w30 synthetic in my car now is that ok?
Here is the chart came with ML owner package. Chart shows 10w30 is good down to -4F, and no upper temperature limit.
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Old 03-26-2011, 10:56 AM   #7 (permalink)
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@ almost 230000 miles on my ML 320 now I think 5W-30 or 10W-30 Mobile 1 is good. That's what I have been using for years and my engine still runs perfect and uses only about 1 quart every 10000 miles... I get whatever Costco has on hand at the time...
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