How often should you replace the spark plug on a Mercedes C320?
Mercedes recommends replacing the spark plugs on C320 models every 100,000 miles. With all the major engine design changes over the years, spark plugs now last up to three times as long as they did in years past. This is good and bad.
What kind of spark plugs should I get for my Mercedes?
When it comes to spark plugs for your Mercedes-Benz, the original OEM plugs would be a safe choice. There is no need to spend more money on the latest high-tech spark plugs.
Can a hotter spark plug cause pre ignition?
If you use hotter spark plugs you may experince pre-ignition issues. The higher the number the colder the heat range. Spark plug heat range on most Mercedes-Benz cars is 6. Which are some Mercedes-Benz engine numbers? Your Mercedes-Benz has over 100k miles.
What do spark plugs do in a car?
Spark plugs are used to ignite the fuel-air mixture in the engine’s combustion camber. New spark plugs are a must for any good tune-up. Check for abnormal pitting or charred plug ends. Also check each plug against each other. Any strange variations among plugs are a sure indicator that something is wrong with a particular cylinder.
Where are the spark plugs on a Mercedes-Benz C320?
There are twelve plugs on the C320 and some of the ones at the rear of the engine are more difficult to access, just get yourself a 5/16 thin walled socket along with a series of extensions and a universal joint and remove each plug.
How do you replace a spark plug on a Mercedes Benz?
Installation is the reverse of removal. You will need to remove the two air inlet ducts (red arrows) as well as the front engine cover (yellow arrow) to get access to the air filter housing on top of the engine. Remove each duct by compressing them towards the engine (red arrow) and slipping them off the air inlet.
Why are spark plugs hard to replace on a cold engine?
Remember work on a cold engine, a hot engine causes the metal to expand, making the removal of the plugs difficult and it also causes the metal to become “softer” making cross threading easier. Here is a picture of an old plug (right side) and a new one side by side.
How to replace spark plug in Mercedes Benz W203?
Use a T-30 Torx and remove the bolts holding the coil packs in place. With the bolts gone you can just swing the coils out of the way. You do not need to remove the wires and boots from the plugs but now is a good time to take them off and clean them.
Remember work on a cold engine, a hot engine causes the metal to expand, making the removal of the plugs difficult and it also causes the metal to become “softer” making cross threading easier. Here is a picture of an old plug (right side) and a new one side by side.
Mercedes recommends replacing the spark plugs on C320 models every 100,000 miles. With all the major engine design changes over the years, spark plugs now last up to three times as long as they did in years past. This is good and bad.
Use a T-30 Torx and remove the bolts holding the coil packs in place. With the bolts gone you can just swing the coils out of the way. You do not need to remove the wires and boots from the plugs but now is a good time to take them off and clean them.