BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      05-08-2014, 10:31 AM   #1
135iDCTFan
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Non-DIY Spark Plug Replacement Question/Costs?

My 2011 135i only has 15K miles (about 4K by me - 1K with PPK1). As the second owner (not knowing what type of gas was being run) and never getting awesome gas mileage (>14 city - and not "pushing it" by any means - 15.5 avg per computer and falling) I was thinking about having the spark plugs replaced. Other than lower than expected gas mileage, I'm not having any other issues with the car (as far as I can tell). I'll obviously try to have the dealer replace them under warranty first, but if I need to have this done professionally (not in my skills wheel house), what would you expect to pay? And would this be advisable?

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      05-09-2014, 06:23 PM   #2
SayHack
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well it's a 45min job which means that a independent bmw shop will charge you 1hr labor (yes, they always charge you extra) = $100. OEM spark plugs cost about $12 a peace x 6 = $72. Total = $172 + tax so just call it $180 for everything.

now, should you do it at 15K? i wouldn't. is the deal going to? probably not.....Not trying be mr. negative but it probably won't do anything as far as saving you MPGs. you better off changing oil every 5k, using a fuel injection cleaner every 2-3weaks, and keep it between 2-3k rpm between shifts.

an honestly 14 is not that bad.
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      05-10-2014, 09:31 AM   #3
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Before doing anything I would check the mileage manually. The computers are know to give some strange readings.
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      05-12-2014, 12:14 PM   #4
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Appreciate the feedback! I have no problem paying about $200.00 for the change -- but I think I will wait a while per the recommendation. I will also try to use some injector cleaner as well to see if that helps.

Thanks again-
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      05-13-2014, 10:49 AM   #5
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That price is wishful thinking from a BMW dealer. I paid to have mine changed, and I supplied the plugs myself. I paid over 200 in labor alone. It was a RIP but that is what bmw does outside of warranty.
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      05-13-2014, 11:46 AM   #6
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Quote:
Originally Posted by SayHack View Post
an honestly 14 is not that bad.
I drive like I stole it, and I get 19.2 average. Very little highway driving, JB4 N54. He should be getting better.
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      05-13-2014, 01:19 PM   #7
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How many miles do you usually drive before refueling ? I sometimes see extremely low mileage (150miles ) and the fuel light comes on. I have Cobb stage 2 aggressive ..
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      05-13-2014, 02:05 PM   #8
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Wish I could tell you the miles per tank, but I haven't been tracking them specifically. I"ll try to gauge this on my next fill-up.

Not exactly sure what impact running Cobb Stage 2 would be on mpg, but I would think it would be pushing more fuel into the engine to generate more power. But I could be totally off base on that.
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      05-28-2014, 08:22 PM   #9
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Quote:
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I drive like I stole it, and I get 19.2 average. Very little highway driving, JB4 N54. He should be getting better.
+1 here... I get about 21mpg with lots of highway commute and about 19mpg on the weekends. Sounds like you might have issues, although with that mpg I would have suspected maybe a check engine light..but maybe not. I would consult the dealer.
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      05-28-2014, 09:36 PM   #10
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My independent BMW shop charged me a little less than $200 for all new plugs.
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