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I have an '09 and am considering the change. 60k miles in my car but no known reason to me I should other than the expired time limit. Why did you decide to replace yours?
I have an '09 and am considering the change. 60k miles in my car but no known reason to me I should other than the expired time limit. Why did you decide to replace yours?
I'm approaching 100K miles and the plugs have not been replaced. The dealer "inspected" them at 62K miles and said they were good. The good folks at NGK provided me with a tech bulletin from Mercedes that changed the spec from a "6" heat range to a "7" heat range so I have obtained NGK PLKR 7A MPP33 plugs.
I have since begun doing most of the maintenance tasks myself (following a debacle where the dealer insisted that a transmission refill took only 5 quarts of fluid and sent me home that way -- I drove to another dealer who filled it properly and have never gone back to the original dealer).
The car is still performing properly, and I've had no misfires or any other malady but I took one plug out and found its gap had worn to .042 in. The specs call for .031.
I am going through oil, filters, brake pads, rotors, brake fluid, and tires, and I figured this was just a good time to make it all fresh.
The car is otherwise perfect and continues to provide 30 - 31 mpg on the highway. I've had it on the alignment rack three times in its life, and each time, no changes were made. The current tires have gone 43K miles and are evenly worn.
On my last visit to the dealership I was provided with a new "C300". It is a wonderful replacement, and I would have likely considered it more if the issue with the transmission fluid had not come up. We'll likely replace my wife's car with one at some point in the next year (her C230 has almost 250K on it).
Yeah coil replace only when broken per auto parts guy. It's been a few years and now stores are recommending iridium plugs at temp range 7 which is a little cooler than the 6 originals (NGK LKR7AIX)
Dealer wants $500 now for plugs
Last edited by Bobby204; Aug 30, 2019 at 01:47 AM.
so i put those iridium R7 in and car runs bit sluggish, so I reset the ecu and engine perked up.
Anyways, anything the old plugs are telling me? they all had ash deposit of various amounts, I blew them off. 2 threads are drier while 4 are oily. TIA for youe feedback!
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