CHADisBAD

I was going to post this a few days ago when I did my plug swap. These plugs were removed from my 03 SL55 with 64k, they were in pretty rough shape, and I had a hell of a time just trying to back them out. I honestly do not think they had ever been changed.

I went with a 1 stage colder NGK 7AIX plug, and used lots of anti-seize. These went in MUCH easier.

fxrs1955

They look like originals.

CHADisBAD

yes im pretty sure they were.

aeroman

Book says change them at 60K. Is it better to change them earlier?

jrgator

It's more of an age issue than mileage.
Over time the plugs tend to "weld" themselves to the heads, that's why the recommended service is based on mileage or age of vehicle.

aeroman

ahhh Now I know why my tech at the stealer is suggesting a 1600 dollar plug change at 27K.

CHADisBAD

this makes sense, because i was worried mine might have been cross threaded at first.

pdjv

Yes - the OE plugs are a bear to remove. Like you I was worried a couple of them were cross-threaded. The plugs looked pretty tired at 47K.

fxrs1955

1600 for plugs alone?

mcguirja

I believe Aeroman has a 65 not 55 so 1600 not really surprising.

aeroman

Yup 65