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W212 MPG lowered after spark plug replacement

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E-Class (W212) 2010 - 2016: E 350, E 550

W212 MPG lowered after spark plug replacement

 
Old 09-17-2018, 05:59 PM
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2013 GL450 and a 2011 E350
W212 MPG lowered after spark plug replacement

I have a 2011 E350 sedan with 105K miles. I did a service B on it and replaced the spark plugs. I used Bosch YR7MPP33 plugs which are OEM for my car. I noticed that the mpg went down instead of up as expected. I was averaging 21.5 mpg with old plugs and now am getting 15.5 mpg. Only have been running with new plugs for a day. Is this normal? What could cause this problem? The car drives very good, It actually feel a bit smoother and picks up faster. I torqued the plugs to 16 ft-lbs..
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Old 09-17-2018, 06:35 PM
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Had the same issue , with bosch , changed to NGK and all became good.
maybe there were other factors involved but yeah
torqued them to about 20nm i think it was

Last edited by belarus27; 09-18-2018 at 11:13 AM.
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Old 09-17-2018, 06:40 PM
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2011 E-350 4Matic Sport
How did you determine 6 mpg drop in one day of use? That seems like a huge decrease.

I know that Bosch and NGK are used by MB and I've seen other posts relating to mpg. In my case I changed oem Bosch for same and gained almost a couple of mpg.

Last edited by Mud; 09-17-2018 at 06:43 PM.
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Old 09-17-2018, 06:55 PM
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the mpg is displayed immediately while your driving on a E350. It's always been spot on. I will change to the NGK and see if it fixes the problem.
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Old 09-17-2018, 09:22 PM
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Will be interesting to see results. I think the oem NGK plugs are Laser Platinum PLKR7A.
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Old 09-18-2018, 02:13 AM
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Bosch and ngk

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Old 09-18-2018, 09:59 AM
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Originally Posted by vinicio75 View Post
I torqued the plugs to 16 ft-lbs..
See attachment.
Attached Files
File Type: pdf
Replace spark plugs.pdf (296.9 KB, 71 views)
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