Yes you can mix them with no issue. Jim
Mixing Mobil 1s
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'19 E63S sedan
Mixing Mobil 1s
My dealer has switched to the new Mobil 1 5W-40 ESP but I have most of a case of 0W-40 left. A have to add a quart every 2,500 miles or so (normal for S65s). That would make the mixture almost half and half by the next service. Should I worry? I understand the 5W-40 ESP is not even available retail, meaning I can't imagine what else one is supposed to do.
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Debadged 6-Speed '05 C320 Sports Coupe
This is the only Mobil 1 5W-40 that I found on their web site. It is wrong for the vehicle. What oil are they using?
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From: San Jose area
'19 E63S sedan
This is the only Mobil 1 5W-40 that I found on their web site. It is wrong for the vehicle. What oil are they using?
http://www.mobil.com/USA-English/Lub...la_M_5W-40.asp
It's apparently only being shipped to dealers, who are replacing the 0W-40, per the new MB 229.51 spec.
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Debadged 6-Speed '05 C320 Sports Coupe
The Mobil 1 ESP Formula M 5W-40 oil is appropriate for vehicles that require MB 229.51 oil, but not for vehicles that require MB 229.5 oil.
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From: San Jose area
'19 E63S sedan
The Mobil 1 ESP Formula M 5W-40 oil is appropriate for vehicles that require MB 229.51 oil, but not for vehicles that require MB 229.5 oil.
See also:
https://mbworld.org/forums/e-class-w210/192861-has-mb-changed-recommendation-mb1-0w-40-5w-40-w210-2001-a.html
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03 E500 and Corvette
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2006 E320 CDi, 2008 3/4 Ton Suburban, 2007 "rice rickshaw" Accord 5 speed
My dealer has switched to the new Mobil 1 5W-40 ESP but I have most of a case of 0W-40 left. A have to add a quart every 2,500 miles or so (normal for S65s). That would make the mixture almost half and half by the next service. Should I worry? I understand the 5W-40 ESP is not even available retail, meaning I can't imagine what else one is supposed to do.
The low ash oils are only relevent for diesel engines for the time being. That is why we should all buy high powered cars that do not require too much pampering. I dread what the future diesel engines are going to be like when it comes to maintenance.
With Rep Henry Waxwoman and Al Sore hugging trees so hard they are going to squeeze the life out of cars and car owners if not kicked out.
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From: San Jose area
'19 E63S sedan
My understanding is the low-ash oil prevents contamination of the urea-injection catalyst system on the upcoming 50-state diesels. But the dealers are switching to that oil for all cars, since they only stock one kind of oil. I'm not worried about the impact on mileage -- only on the safety of mixing the 5W40 ESP that the dealer uses with the 0W40 non-ESP I can buy retail. The US hotline (800-FOR-MERC) confirms it's ok to mix the oils. They even put a record of the conversation in my file in my dealer's computer to document the factory advice. They do some stuff right!
BTW, the oil consumption seems to have dropped with 10,000 miles on the engine, as predicted by the dealer. I just drove about 1,000 miles on I-5 (mostly above 100 MPH; occasionally 130-140) and it used about .4 quart per the test-mode readout. Since it seems to burn much more oil at these high speeds than at our normal California 85 MPH, it's doing a lot better than the quart per 2,000 miles I had been seeing. Maybe I won't need to mix as much as I thought.
BTW, the oil consumption seems to have dropped with 10,000 miles on the engine, as predicted by the dealer. I just drove about 1,000 miles on I-5 (mostly above 100 MPH; occasionally 130-140) and it used about .4 quart per the test-mode readout. Since it seems to burn much more oil at these high speeds than at our normal California 85 MPH, it's doing a lot better than the quart per 2,000 miles I had been seeing. Maybe I won't need to mix as much as I thought.
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03 E500 and Corvette
Our E500 had 65,000 miles and we had 8000 miles on the last service oil change when we left for Canada. We drove 3500 miles at highway speeds up to 75 
mph sustained for hours. Upon return we still don't show the add oil on the indicator. Sorry no dip stick.
Jim
mph sustained for hours. Upon return we still don't show the add oil on the indicator. Sorry no dip stick. Jim
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2006 E320 CDi, 2008 3/4 Ton Suburban, 2007 "rice rickshaw" Accord 5 speed
You need to order one of those MB oil measuring "tools"!
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03 E500 and Corvette
