Hi everyone,
Replaced the spark plugs on a 2.0L FSI engine with 150,000km.
Apparently we can determine the overall health of an engine by checking spark plugs
For example I read online that in general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition. Dark coloring, such as heavy black wet or dry deposits, can indicate an overly rich condition.
The old spark plug I removed looked like this. What do you reckon?

Also I noticed on the other end of the body a gold coloring as illustrated below. Any idea what it could be/what it means?

Also, here's a look at inside. Looks clean besides a bit of what looks like oil deposit but I've seen worse. (The ignition coil where in good condition).

However, cylinder 4 had some sort of deposit on the head cylinder, where the spark plug sits. When I started unscrewing the old spark plug, it felt like there was "sand" between the spark plug and head cylinder. Upon inspecting the head cylinder I could see some debris down there.

Any idea what it could be and could it be dangerous for the engine? I didn't have anything to suck it out unfortunately.
Thanks for any insights you may have
Replaced the spark plugs on a 2.0L FSI engine with 150,000km.
Apparently we can determine the overall health of an engine by checking spark plugs
For example I read online that in general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition. Dark coloring, such as heavy black wet or dry deposits, can indicate an overly rich condition.
The old spark plug I removed looked like this. What do you reckon?

Also I noticed on the other end of the body a gold coloring as illustrated below. Any idea what it could be/what it means?

Also, here's a look at inside. Looks clean besides a bit of what looks like oil deposit but I've seen worse. (The ignition coil where in good condition).

However, cylinder 4 had some sort of deposit on the head cylinder, where the spark plug sits. When I started unscrewing the old spark plug, it felt like there was "sand" between the spark plug and head cylinder. Upon inspecting the head cylinder I could see some debris down there.

Any idea what it could be and could it be dangerous for the engine? I didn't have anything to suck it out unfortunately.
Thanks for any insights you may have
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