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2005 SLK350
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Been smelling oil and feared the worst. Investigated, identified plugs as culprits. Searched this forum and BICKETY-BAM my fears were put to rest. Now to order those puppies.....
I'm left to wonder what purpose these "expansion" plugs serve. The name implies that they might expand under increased pressure, perhaps to avoid damage elsewhere. I remember my uncle telling me "you can't have too much oil pressure" but that didn't make sense then and it doesn't make sense now. Any comments?

Btw thanks to all who take the time to write about and elaborate on these issues. It has really helped relieve some of the anxiety out of owning this beast of a car. I'd like to buy you all a Coke to show my appreciation.
 

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2005 SLK350
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2,038 Posts
Does anyone have a definite part no for these plugs, or will it be vin decided, i have a 2005 350, and not sure which ones to get
Forgive me not posting actual part numbers. This first pic is the smaller plug, of which you will need two. The second pic is the larger plug. One is necessary.

I purchased these from a MB dealership. The technician I talked to said he installs them dry, with the “teeth” are aligned vertically, as opposed to horizontally.

For those researching the subject, the technician told me he replaces them routinely, about every 50,000 miles. A PITA perhaps but cheap and simple to replace.

My car is an 05 350. Cheers
 

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