Went from 5w-40 to 0w-40 by mistake. Should I switch back?? - Mercedes-Benz Forum
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post #1 of 32 (permalink) Old 05-15-2019, 04:03 PM Thread Starter
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Went from 5w-40 to 0w-40 by mistake. Should I switch back??

Well I have been using Mobil 1 5w-40 from the dealership since I bought the car reason being they told me that Mercedes had made the switch from the 0w-40 to the 5w-40 for our engines through some bulletin. That was back in 2012. I go there today to find out that my regular parts guy "no longer works there" I am guessing, they let him go. Great guy by the way. Anyhow, get my 8 quarts of oil along with the new filter, wish the new guy Good Luck and I leave. Get home, jack the car up let the old oil out, put three quarts of the new oil in and I happen to look at the box. Sh*t it is 0w-40 Now I realize that both oils are fine for our cars and I would probably never be able to tell the difference and so fourth but my OCD keeps doubting. So my question is, should I run the 0-40 for now and then my next oil change go back to the 5-40?? Or go get the same 5-40 I been using all along and change to that right away?? What do the car gurus here suggest??
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post #2 of 32 (permalink) Old 05-15-2019, 05:51 PM
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I am not 100% sure, but if the oil satisfies the MB 229.3 criteria, you should be good to go. Some on the forum use Mobil1 0W-40 with good results.

John

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post #3 of 32 (permalink) Old 05-15-2019, 06:05 PM Thread Starter
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I am not 100% sure, but if the oil satisfies the MB 229.3 criteria, you should be good to go. Some on the forum use Mobil1 0W-40 with good results.

John

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Thanks John,

You are absolutely right, a lot of the guys here use it and actually that is what Mercedes used to recommend before they made the switch to the 5W 40. I guess my main concern is that we are going into the summer months here and the temps go well above 100 at times so do not know if the 0w 40 will be thick enough. If it was the winter I would have had no problem with it
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post #4 of 32 (permalink) Old 05-15-2019, 11:54 PM
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Hi Sonny,

Been here done this to death

The 0W as opposed to 5W means, (in laymans terms before all the Oil Tycoon Experts start up chiming in), it performs better from a colder temperature, and the 40 figure means it will be the same Hot Performance as the 5W / 40

Leave it be it's fine

HTH,
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post #5 of 32 (permalink) Old 05-16-2019, 12:43 AM
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Wow you must really have bad ocd if you are concerned about this . Ow-40 was the original fill in these cars and is perfectly fine. So is 5w-40 so is 15w-40. In fact almost none of us live in climates where it matters , and as Dave says the 0 and 5 have nothing to do with summer months anyway
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post #6 of 32 (permalink) Old 05-16-2019, 03:47 AM Thread Starter
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Originally Posted by Dave2302 View Post
Hi Sonny,

Been here done this to death

The 0W as opposed to 5W means, (in laymans terms before all the Oil Tycoon Experts start up chiming in), it performs better from a colder temperature, and the 40 figure means it will be the same Hot Performance as the 5W / 40

Leave it be it's fine

HTH,
Thanks man!! Feel better already
Question is, do I go back the next oil change or just stay with the 0-40?? I just can't believe I didn't look at the bottles prior. Slacking off my friend slacking off lol
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post #7 of 32 (permalink) Old 05-16-2019, 03:53 AM Thread Starter
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Wow you must really have bad ocd if you are concerned about this . Ow-40 was the original fill in these cars and is perfectly fine. So is 5w-40 so is 15w-40. In fact almost none of us live in climates where it matters , and as Dave says the 0 and 5 have nothing to do with summer months anyway
Thanks Tusabes,
Yeah I realize all of the above and you are absolutely correct on all but OCD kicks in especially when I have used the same viscosity oil religiously for the last 7 years lol I guess I don't like changes
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post #8 of 32 (permalink) Old 05-16-2019, 04:12 AM
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It doesn’t Matter whether you stay with 0w-40, go back to 5w-40, or even mix the two .

Much more important is how often you check the level and change the oil . Those actually matter .
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post #9 of 32 (permalink) Old 05-16-2019, 04:18 AM Thread Starter
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It doesn’t Matter whether you stay with 0w-40, go back to 5w-40, or even mix the two .

Much more important is how often you check the level and change the oil . Those actually matter .
Good point! And trust me I stay on top of that. I change the oil twice a year or every 6 months since I do not drive the car everyday and do not go by mileage.
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post #10 of 32 (permalink) Old 05-16-2019, 10:50 AM
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No need to switch back if you don't want to. Since I live in an area where it does get below freezing in the winter, I've taken to using 0W-30 even in the Honda Civics (the book calls for 5W-30 or 10W-30). This is because of what Dave pointed out, above, about the "W" rating for oils. In my Benzes, I continue to use 0W-40 (Mobil FS European Formula). Works great. In Las Vegas or Phoenix, AZ summers, I think 5W-40 or even 10W-40 would also work, due to the ambient temperature.

When it's cold, I *want* lower viscosity, and all it means is that shearing of the oil molecules will take place a little sooner, vs. if the W rating and the "hot" rating are closer. That's all. However, remember that M-B's computer says to change your oil typically every 10,000 miles (the "A Service"). I do it every 5,000 miles. This seems to work well, because the '03 S430's engine has gradually quieted down over the last couple of years. And in all of my M113-equipped cars, I use exclusively the white "fleece" filters, instead of the paper ones (the S600 and the E320 CDI factory filters are paper, so they're different).

So, you're fine.
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