I now have 97k miles - Mercedes-Benz Forum

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post #1 of 20 (permalink) Old 05-31-2009, 01:33 PM Thread Starter
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I now have 97k miles

on my 01' Benz C320 and I heard from my mechanic that I should change my oil, now Im using Mobil1 5-40. any suggestions if what kind of oil I should use ? I live in california averaging summer temp 75 to 100 degree, and 55 to 70 in winter season if that matters. Also driving it 10miles/day only and 40miles on the weekends.

Thanks in advance.

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post #2 of 20 (permalink) Old 05-31-2009, 01:41 PM
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Mercedes keeps changing their minds on this. 0W40 was recommended for years, then it became 5W40. Someone on the forum said MB switched back to 0W40 but I asked my dealer last week and they still use 5W40. Either should be fine as long as it has the MB spec listed on the label (229.5 or 229.51).

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post #3 of 20 (permalink) Old 05-31-2009, 01:50 PM Thread Starter
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Mercedes keeps changing their minds on this. 0W40 was recommended for years, then it became 5W40. Someone on the forum said MB switched back to 0W40 but I asked my dealer last week and they still use 5W40. Either should be fine as long as it has the MB spec listed on the label (229.5 or 229.51).
how about 10-30 is it okay to use too ? does it matter if mine is high mileage or not ? so no matter how many miles stick with 5-40 ?

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post #4 of 20 (permalink) Old 05-31-2009, 02:36 PM
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how about 10-30 is it okay to use too ? does it matter if mine is high mileage or not ? so no matter how many miles stick with 5-40 ?
If you can find a 10W30 with the MB spec then yes. According to MB, high mileage makes no difference. Plus with higher mileage you don't want to go down to 30 (thinner) anyway. The best spec oil out there is Mobil1 5W40 ESP Formula M (229.51).

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post #5 of 20 (permalink) Old 05-31-2009, 02:50 PM
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The best spec oil out there is Mobil1 5W40 ESP Formula M (229.51).
Wasn't that LATELY judged as diesel only recommendation?
Dealers buy oil in bulk and quite often they tend to use what they have in the barrow, than what is recommended for last few months. Sure with technology change it is not always easy to keep the track, but to my knowledge 0-40 is the only approved for gassers.
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post #6 of 20 (permalink) Old 05-31-2009, 03:00 PM
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Wasn't that LATELY judged as diesel only recommendation? Dealers buy oil in bulk and quite often they tend to use what they have in the barrow, than what is recommended for last few months. Sure with technology change it is not always easy to keep the track, but to my knowledge 0-40 is the only approved for gassers.
That's what I thought too Kajtek1 but my dealer still uses 5W40. I asked the guys in parts and they said MB changed their mind again. Do you remember the thread where we were discussing this? I can't remember if we have firm evidence or if was just someone's opinion or a rumor.

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post #7 of 20 (permalink) Old 05-31-2009, 03:06 PM
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It is not a rumor or opinion. It is directly from MB's own directive about 6 months ago.

229.51 oil should not be used in gasoline engines. Whether dealers follow MB's recommendations or requirements is another story.

http://www.benzworld.org/forums/gene...ml#post3297052
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post #8 of 20 (permalink) Old 05-31-2009, 03:13 PM
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Thanks for the link loubapache. In the mean time I found your thread citing Wolfgang's website too.

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post #9 of 20 (permalink) Old 05-31-2009, 03:29 PM
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The current recommendation is always on MBUSA website or startechinfo website. It is just the the "back pedal" language Mercedes cannot publically display (forever).

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post #10 of 20 (permalink) Old 05-31-2009, 03:42 PM
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I apologize for giving ecko mis-leading information. I remembered us discussing the 229.5 vs. 229.51 here correctly, just not where I read it. That's partly what prompted me to ask the dealer what they are now using when I was there last week. I have 5W40 in mine because that was the MB recommendation when I had the last change. 0W40 is going in it in about 1500 miles.

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