W212 MPG lowered after spark plug replacement
09-17-2018, 05:59 PM
#1
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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..
09-17-2018, 06:35 PM
#2
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2010 e550 p2
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
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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vinicio75 (09-17-2018)
09-17-2018, 06:40 PM
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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.
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.
09-18-2018, 09:59 AM
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