Cost of Changing Spark Plugs

Hi. I have a 2009 335xi with 41,000 miles and I'm thinking about new spark plugs. It's still under the CPO warranty, but no maintenance warranty left. The dealer told me it will be about $400 to change the spark plugs... that seems quite high to me. But, I'm afraid if I do it or have somebody other than the dealer do it, future warranty work could be an issue. Does anyone have thoughts? Thanks.

My Indy quoted 300 as a reference point.
If you look at the DIY you do have to remove quite a
bit of stuff to get to the back two plugs.
But that's California prices.

Do you have two hours and a couple of tools like a spark plug wrench needed for this car? They can be purchased by our vendors for 15-20 bucks. Plugs run around a 100 bucks or less and a torque wrench to torque the plugs in. Seems like a lot of tools but most of us have these which are considered common.
There is nothing hard about changing the plugs and there are many DIYs with pictures to guide you step by step through the process. Do the plug install with the engine cold or having sat for many hours.
That way you know the job was done right and no one can question that to include the dealer. Annotate that in your warranty book or where you keep your records to include the receipt for the plugs and be happy...

Question... Is it advisable to change the plugs at 41K?

Originally Posted by WendyS

Hi. I have a 2009 335xi with 41,000 miles and I'm thinking about new spark plugs. It's still under the CPO warranty, but no maintenance warranty left. The dealer told me it will be about $400 to change the spark plugs... that seems quite high to me. But, I'm afraid if I do it or have somebody other than the dealer do it, future warranty work could be an issue. Does anyone have thoughts? Thanks.

Wanna save some cash?

Click here.

Then, click here.

Here's good info on misfires and what's happening - not exclusive to Cobb - any capable OBDII cable reading BMW codes will work famously:




You might want to 'scope yer ride to verify/assure good result - lotsa info here.

Don't have an O-Scope? No worries....view this:

Not so sure but if it's benefit on MPG I would do it.

Originally Posted by joeyl13

Question... Is it advisable to change the plugs at 41K?

BMW calls for 45k for the 335i and 100k for the NA motors. OP has a 335i, you have a non-turbo engine.

Tom

On a non Turbo not necessary to 90k
The Turbo's are suppose to get done every 45 k.
Mike Millers likes them changed at 60k (non turbo)with one of the other reasons
to change them being to make sure they don't get seized up in place and to
check for oil leakage on the valve cover.

Originally Posted by Tom K.

BMW calls for 45k for the 335i and 100k for the NA motors. OP has a 335i, you have a non-turbo engine.

Tom

Correction, OP has a turbo engine

Originally Posted by WendyS

Hi. I have a 2009 335xi with 41,000 miles and I'm thinking about new spark plugs. It's still under the CPO warranty, but no maintenance warranty left. The dealer told me it will be about $400 to change the spark plugs... that seems quite high to me. But, I'm afraid if I do it or have somebody other than the dealer do it, future warranty work could be an issue. Does anyone have thoughts? Thanks.

Another thought: Pretty good video on easy oscilloscope analysis, a thing that'll resonate w/many previous posts. Stick with 'em if your view....might be li'l slow but yields good things.

Note: Picoscope, like nearly all PC based oscilloscopes, mainly a fast ADC; USB 2.0. Have a couple - very versatile software. Good juju. May buy their auto kit.

Stock I would go with BMW's recommendation & modified 25K miles. Agree with the guys who said do it yourself. You will save money even if you have to buy the tools & also learn something about your car by looking at the condition of the plugs you pull out. Another source of the plug tool $19 & plugs $11.50 each is BMS.

Originally Posted by unrealii

Correction, OP has a turbo engine

No correction as that is what I posted. The 335i is either a twin or single turbo motor, depending on year.

Tom

Originally Posted by Tom K.

No correction as that is what I posted. The 335i is either a twin or single turbo motor, depending on year.

Tom

I was referring to your comment that OP has non-turbo

Sent from my HTC VLE_U using Bimmer App

Thanks for all the intersting input. I have read the plugs should be changed at 45k miles on the turbo. We were planning on having to buy a few new tools for this car, so it will be a spring job.

Bosch OEM plugs are only $4.19 each at the local Advance Auto Parts. ~$25 + TX. Am I missing something when comparing them to the $79 from "fleaBay"? They will have to order them, of course. This will likely be my next DIY job after taking care of my leaky Trans.

Jeff

As long as its the same Bosch part # is on the metal ring below the insulator you are good to go. Only difference besides price is one says Bosch on the insulator the other says BMW.

May do this soon as I am close to 90k miles. Dealer is quoting $375 though with 10% coupon that drops to $338. Indy shop wants $198+$20 per plug, after parts disc. that drops to $290.