When is the right time for new spark plugs on SLK 320 (2001)


#1

Hi,

I have a 2001 SLK 320. It has 48k miles on it. I’ve bought it used in 2005. It had 6k miles on it when I bought it. So it spent its early years kept in a garage. For the next 5 years I have been driving it everyday to work, but my commute is short. So it only has 48k on it.

My question is when is a good time to replace the spark plugs, given my circumstances. The normal thing to do would be to replace them at 7th year, but I didn’t do it then because of the extreme low mileage. And then I forgot about it. Now it is 10 years old. I wonder you guys think?

I want to do the job myself. So my other question is what is the recommended “spark plug gap” for this car and what is the torque specification?

Phoenix Tong


#2

This car probably has platinum or iridium plugs in it. Good for 50-100k miles.
The new plugs will come gapped. Don’t try to adjust.
The best bet is to stick with the same brand and part# plug it came with.
Now’s a good time to change them. Mainly so they won’t get stuck in place.


#3

Thanks for the reply.

This car does have platinum. Anyone know the torque setting to use?

Another item I am wondering if I should replace is the poly-v-belt, which is also original.

Phoenix


#4

At 10 years I would change the belt, radiator hoses and thermostat.
Inspect the rubber brake hoses and the rubber boots on suspension parts.